From df32d7dbe5ac23c3562e38549d4523c92f8ad431 Mon Sep 17 00:00:00 2001
From: unidesk-code-queue-runner <code-queue-runner@users.noreply.github.com>
Date: Sat, 23 May 2026 15:33:17 +0000
Subject: [PATCH] fix: remove resource explorer from workbench

---
 scripts/dev-cloud-workbench-smoke.test.mjs    |  89 +-
 scripts/src/dev-cloud-workbench-smoke-lib.mjs | 845 +++---------------
 web/hwlab-cloud-web/app.mjs                   | 273 +-----
 web/hwlab-cloud-web/help.md                   |   8 +-
 web/hwlab-cloud-web/index.html                |  43 -
 web/hwlab-cloud-web/scripts/check.mjs         |  87 +-
 web/hwlab-cloud-web/styles.css                | 215 +----
 7 files changed, 205 insertions(+), 1355 deletions(-)

diff --git a/scripts/dev-cloud-workbench-smoke.test.mjs b/scripts/dev-cloud-workbench-smoke.test.mjs
index 3ac58b9b..86f6a692 100644
--- a/scripts/dev-cloud-workbench-smoke.test.mjs
+++ b/scripts/dev-cloud-workbench-smoke.test.mjs
@@ -219,9 +219,9 @@ test("dedicated layout smoke CLI supports static build and DEV live shorthand",
   assert.equal(liveExplicit.urlExplicit, true);
 });
 
-test("source/default smoke covers #278 sidebar collapse static contract", () => {
+test("source/default smoke covers #352 resource explorer removal contract", () => {
   const report = runDevCloudWorkbenchStaticSmoke();
-  assert.equal(report.checks.find((check) => check.id === "feedback-278-sidebar-collapse-contract")?.status, "pass");
+  assert.equal(report.checks.find((check) => check.id === "feedback-352-resource-explorer-removed")?.status, "pass");
 });
 
 test("source/default smoke covers #276 two-column wiring long-table contract", () => {
@@ -693,7 +693,7 @@ test("Code Agent quick prompt fixture fills input, does not autosend writes, and
   assert.equal(layout.observations.some((item) => item.viewport.width === 390 && item.layoutOk), true);
 });
 
-test("layout smoke verifies desktop and mobile sidebar collapse geometry", async () => {
+test("layout smoke verifies desktop and mobile default workbench geometry without resource explorer", async () => {
   const report = await runDevCloudWorkbenchLayoutSmoke();
   if (report.status === "skip") {
     assert.match(report.summary, /Playwright is unavailable/u);
@@ -718,17 +718,9 @@ test("layout smoke verifies desktop and mobile sidebar collapse geometry", async
     assert.equal(report.validationCommands.includes(command), true, `missing ${command}`);
   }
   for (const id of [
-    "layout-desktop-expanded",
-    "layout-desktop-collapsed",
-    "layout-desktop-restored",
-    "layout-narrow-desktop-expanded",
-    "layout-narrow-desktop-collapsed",
-    "layout-narrow-desktop-restored",
-    "layout-mobile-collapsed",
-    "layout-mobile-drawer",
-    "layout-explorer-resize-desktop",
-    "layout-explorer-resize-narrow-desktop",
-    "layout-explorer-resize-mobile",
+    "layout-desktop-default",
+    "layout-narrow-desktop-default",
+    "layout-mobile-default",
     "layout-gate-desktop",
     "layout-gate-narrow-desktop",
     "layout-gate-mobile"
@@ -750,60 +742,29 @@ test("layout smoke verifies desktop and mobile sidebar collapse geometry", async
   assert.equal(report.checks.find((check) => check.id === "layout-issue-287-future-hardware-status-tabs")?.status, "pass");
   assert.equal(report.checks.find((check) => check.id === "layout-issue-288-future-single-table-gate")?.status, "skip");
 
-  const desktopCollapsed = report.checks.find((check) => check.id === "layout-desktop-collapsed")?.observations;
-  assert.equal(desktopCollapsed.explorerCollapsed, true);
-  assert.equal(desktopCollapsed.toggle.ariaLabel, "展开左侧资源树");
-  assert.equal(desktopCollapsed.toggle.text, "展开资源树");
-  assert.equal(desktopCollapsed.collapsedWidthGain, true);
-  assert.equal(desktopCollapsed.keyTargetsReachable, true);
-  assert.equal(desktopCollapsed.wiring.longTableOk, true);
-  assert.equal(desktopCollapsed.wiring.noHorizontalScroll, true);
-  assert.equal(desktopCollapsed.wiring.headers.length, 2);
-  assert.deepEqual(desktopCollapsed.wiring.legacyHeaderHits, []);
-  assert.equal(desktopCollapsed.wiring.horizontalScroll.panelScrollWidth <= desktopCollapsed.wiring.horizontalScroll.panelClientWidth + 2, true);
-  assert.equal(desktopCollapsed.resizeHandle.ok, false);
+  const desktopDefault = report.checks.find((check) => check.id === "layout-desktop-default")?.observations;
+  assert.equal(desktopDefault.removedSelectorsAbsent, true);
+  assert.equal(desktopDefault.keyTargetsReachable, true);
+  assert.equal(desktopDefault.wiring.longTableOk, true);
+  assert.equal(desktopDefault.wiring.noHorizontalScroll, true);
+  assert.equal(desktopDefault.wiring.headers.length, 2);
+  assert.deepEqual(desktopDefault.wiring.legacyHeaderHits, []);
+  assert.equal(desktopDefault.wiring.horizontalScroll.panelScrollWidth <= desktopDefault.wiring.horizontalScroll.panelClientWidth + 2, true);
+  assert.equal(Object.hasOwn(desktopDefault.boxes.shell, "text"), false);
+  assert.equal(Object.hasOwn(desktopDefault.semanticOverlapChecks[0].boxes["#m3-control-form"], "text"), false);
+  assert.equal(desktopDefault.failures.length, 0);
+  assert.equal(desktopDefault.semanticOverlapChecks.every((check) => !check.overlaps), true);
+  assert.equal(desktopDefault.overflowChecks.every((check) => check.ok), true);
 
-  const mobileCollapsed = report.checks.find((check) => check.id === "layout-mobile-collapsed")?.observations;
-  assert.equal(mobileCollapsed.explorerCollapsed, true);
-  assert.equal(mobileCollapsed.defaultCollapsedMobile, true);
-  assert.equal(mobileCollapsed.keyTargetsReachable, true);
-  assert.equal(mobileCollapsed.wiring.longTableOk, true);
-  assert.equal(mobileCollapsed.wiring.noHorizontalScroll, true);
-  assert.equal(mobileCollapsed.resizeHandle.ok, false);
-
-  const desktopExpanded = report.checks.find((check) => check.id === "layout-desktop-expanded")?.observations;
-  assert.equal(Object.hasOwn(desktopExpanded.boxes.shell, "text"), false);
-  assert.equal(Object.hasOwn(desktopExpanded.semanticOverlapChecks[0].boxes["#m3-control-form"], "text"), false);
-  assert.equal(desktopExpanded.failures.length, 0);
-  assert.equal(desktopExpanded.semanticOverlapChecks.every((check) => !check.overlaps), true);
-  assert.equal(desktopExpanded.overflowChecks.every((check) => check.ok), true);
-  assert.equal(desktopExpanded.resizeHandle.ok, true);
-
-  const desktopResize = report.checks.find((check) => check.id === "layout-explorer-resize-desktop")?.observations;
-  assert.equal(desktopResize.pass, true);
-  assert.equal(desktopResize.before.handle.ariaLabel, "拖拽调整左侧资源树宽度");
-  assert.equal(desktopResize.before.handle.role, "separator");
-  assert.equal(Math.abs(desktopResize.afterDrag.explorerWidth - desktopResize.before.explorerWidth) >= 24, true);
-  assert.equal(desktopResize.afterEnd.explorerWidth, desktopResize.afterEnd.bounds.max);
-  assert.equal(desktopResize.afterHome.explorerWidth, desktopResize.afterHome.bounds.min);
-  assert.equal(desktopResize.collapsed.explorerCollapsed, true);
-  assert.equal(desktopResize.collapsed.handleTabIndex, -1);
-  assert.equal(desktopResize.restored.storage.version, 1);
-  assert.equal(desktopResize.restoredFromStorage.keyTargetsReachable, true);
-
-  const narrowResize = report.checks.find((check) => check.id === "layout-explorer-resize-narrow-desktop")?.observations;
-  assert.equal(narrowResize.pass, true);
-  assert.equal(narrowResize.afterEnd.explorerWidth <= narrowResize.afterEnd.bounds.max, true);
-  assert.equal(narrowResize.restoredFromStorage.noHorizontalOverflow, true);
-
-  const mobileResize = report.checks.find((check) => check.id === "layout-explorer-resize-mobile")?.observations;
-  assert.equal(mobileResize.pass, true);
-  assert.equal(mobileResize.handleDisplay, "none");
-  assert.equal(mobileResize.handleTabIndex, -1);
+  const mobileDefault = report.checks.find((check) => check.id === "layout-mobile-default")?.observations;
+  assert.equal(mobileDefault.removedSelectorsAbsent, true);
+  assert.equal(mobileDefault.keyTargetsReachable, true);
+  assert.equal(mobileDefault.wiring.longTableOk, true);
+  assert.equal(mobileDefault.wiring.noHorizontalScroll, true);
 
   const compact = compactLayoutSmokeCliOutput(report);
   assert.equal(compact.status, "pass");
-  assert.equal(compact.artifacts.screenshotCount, 21);
+  assert.equal(compact.artifacts.screenshotCount, 12);
   assert.equal(compact.failures.length, 0);
   assert.equal(compact.blockers.length, 0);
   assert.equal(JSON.stringify(compact).includes('"checks"'), false);
diff --git a/scripts/src/dev-cloud-workbench-smoke-lib.mjs b/scripts/src/dev-cloud-workbench-smoke-lib.mjs
index 905dbfa9..f2ed4158 100644
--- a/scripts/src/dev-cloud-workbench-smoke-lib.mjs
+++ b/scripts/src/dev-cloud-workbench-smoke-lib.mjs
@@ -209,8 +209,6 @@ const workbenchMarkers = Object.freeze([
   "data-app-shell",
   "workbench-shell",
   "activity-rail",
-  "explorer",
-  "resource-tree",
   "center-workspace",
   "conversation-list",
   "agent-chat-status",
@@ -440,7 +438,7 @@ function runStaticSmoke() {
 
   addCheck(checks, blockers, "feedback-118-complete-nav", hasCompletePrimaryNavigation(files.html), "Primary navigation uses complete Chinese labels and removes the left-rail trusted-records shortcut.", {
     blocker: "contract_blocker",
-    evidence: ["工作台", "内部复核", "使用说明", "资源树"]
+    evidence: ["工作台", "内部复核", "使用说明"]
   });
 
   addCheck(checks, blockers, "feedback-288-gate-single-table", gateSingleTableContract(files), "Internal review /gate is a single read-only table backed by the live diagnostics aggregation route.", {
@@ -489,23 +487,21 @@ function runStaticSmoke() {
     evidence: ["html/body overflow hidden", "workbench-shell 100vh/100dvh overflow hidden", ".view overflow auto"]
   });
 
-  addCheck(checks, blockers, "mobile-workbench-layout-contract", hasMobileWorkbenchLayoutContract(files), "390x844 mobile layout keeps the default workbench reachable and moves the resource tree into a controlled drawer.", {
+  addCheck(checks, blockers, "mobile-workbench-layout-contract", hasMobileWorkbenchLayoutContract(files), "390x844 mobile layout keeps the default workbench reachable without a resource explorer drawer.", {
     blocker: "runtime_blocker",
     evidence: [
-      "syncMobileExplorer collapses resource tree at <=860px",
       "mobile rail spans full height",
       "center workspace and right sidebar share the content column",
-      "resource explorer opens as a full-height drawer"
+      "resource explorer drawer selectors are absent"
     ]
   });
 
-  addCheck(checks, blockers, "feedback-278-sidebar-collapse-contract", hasSidebarCollapseContract(files), "Left resource tree exposes explicit Chinese collapse/expand semantics and releases width for the Agent workspace plus M3 panel.", {
+  addCheck(checks, blockers, "feedback-352-resource-explorer-removed", hasResourceExplorerRemovalContract(files), "Default workbench removes the left resource explorer, quick actions, resource tree, capability cards, and explorer resize handle.", {
     blocker: "runtime_blocker",
     evidence: [
-      "收起左侧资源树 / 展开左侧资源树 aria-label",
-      "收起资源树 / 展开资源树 visible button text",
-      "explorer-collapsed sets explorer column to 0",
-      "collapsed desktop center column minmax(420px, 1fr)",
+      "aside#resource-explorer absent",
+      "#explorer-resize absent",
+      "resource tree / quick actions / capability cards absent",
       "right side keeps a 560-740px M3 status workspace boundary through --right-width"
     ]
   });
@@ -1031,100 +1027,44 @@ export async function runDevCloudWorkbenchLayoutSmoke(args = {}) {
     const mobile = viewportResults.mobile;
     const checks = [
       {
-        id: "layout-desktop-expanded",
-        status: desktop.expanded.pass ? "pass" : "blocked",
-        viewport: desktop.expanded.viewport,
-        summary: "Desktop 1366x768 expanded layout keeps M3 controls, Code Agent input, hardware panels, hit targets, overflow, and outer scroll in contract.",
-        observations: desktop.expanded
+        id: "layout-desktop-default",
+        status: desktop.default.pass ? "pass" : "blocked",
+        viewport: desktop.default.viewport,
+        summary: "Desktop 1366x768 default layout has no resource explorer DOM and keeps M3 controls, Code Agent input, hardware panels, hit targets, overflow, and outer scroll in contract.",
+        observations: desktop.default
       },
       {
-        id: "layout-desktop-collapsed",
-        status: desktop.collapsed.pass ? "pass" : "blocked",
-        viewport: desktop.collapsed.viewport,
-        summary: "Desktop 1366x768 collapsed layout hides the resource tree, increases Agent/M3 usable width, and keeps key controls reachable.",
-        observations: desktop.collapsed
-      },
-      {
-        id: "layout-desktop-restored",
-        status: desktop.restored.pass ? "pass" : "blocked",
-        viewport: desktop.restored.viewport,
-        summary: "Desktop expand action restores the left navigation/resource tree without layout overlap.",
-        observations: desktop.restored
-      },
-      {
-        id: "layout-narrow-desktop-expanded",
-        status: narrowDesktop.expanded.pass ? "pass" : "blocked",
-        viewport: narrowDesktop.expanded.viewport,
+        id: "layout-narrow-desktop-default",
+        status: narrowDesktop.default.pass ? "pass" : "blocked",
+        viewport: narrowDesktop.default.viewport,
         summary: "Narrow desktop 1024x768 layout keeps the right hardware area below the workbench without covered controls or outer scroll.",
-        observations: narrowDesktop.expanded
+        observations: narrowDesktop.default
       },
       {
-        id: "layout-narrow-desktop-collapsed",
-        status: narrowDesktop.collapsed.pass ? "pass" : "blocked",
-        viewport: narrowDesktop.collapsed.viewport,
-        summary: "Narrow desktop 1024x768 collapsed layout releases left-sidebar width without hiding M3 or Code Agent controls.",
-        observations: narrowDesktop.collapsed
-      },
-      {
-        id: "layout-narrow-desktop-restored",
-        status: narrowDesktop.restored.pass ? "pass" : "blocked",
-        viewport: narrowDesktop.restored.viewport,
-        summary: "Narrow desktop 1024x768 restored layout returns the resource tree without incoherent overlap.",
-        observations: narrowDesktop.restored
-      },
-      {
-        id: "layout-mobile-collapsed",
-        status: mobile.collapsed.pass ? "pass" : "blocked",
-        viewport: mobile.collapsed.viewport,
-        summary: "Mobile default layout keeps the resource tree collapsed and preserves Agent input plus M3 tabs/controls.",
-        observations: mobile.collapsed
-      },
-      {
-        id: "layout-mobile-drawer",
-        status: mobile.drawer.pass ? "pass" : "blocked",
-        viewport: mobile.drawer.viewport,
-        summary: "Mobile drawer expansion makes resource controls reachable and can collapse back through the same accessible button.",
-        observations: mobile.drawer
-      },
-      {
-        id: "layout-explorer-resize-desktop",
-        status: desktop.resize?.pass ? "pass" : "blocked",
-        viewport: desktop.resize?.viewport ?? desktop.expanded.viewport,
-        summary: "Desktop left resource tree resize supports pointer drag, keyboard bounds, clamping, localStorage v1 restore, and collapse/expand width preservation.",
-        observations: desktop.resize
-      },
-      {
-        id: "layout-explorer-resize-narrow-desktop",
-        status: narrowDesktop.resize?.pass ? "pass" : "blocked",
-        viewport: narrowDesktop.resize?.viewport ?? narrowDesktop.expanded.viewport,
-        summary: "Narrow desktop left resource tree resize clamps against the stacked layout so M3 controls and Code Agent input remain reachable.",
-        observations: narrowDesktop.resize
-      },
-      {
-        id: "layout-explorer-resize-mobile",
-        status: mobile.resize?.pass ? "pass" : "blocked",
-        viewport: mobile.resize?.viewport ?? mobile.collapsed.viewport,
-        summary: "Mobile layout disables the drag handle as a hit target and keeps the drawer/collapse flow reachable without horizontal overflow.",
-        observations: mobile.resize
+        id: "layout-mobile-default",
+        status: mobile.default.pass ? "pass" : "blocked",
+        viewport: mobile.default.viewport,
+        summary: "Mobile 390x844 default layout has no resource drawer and preserves Agent input plus M3 tabs/controls.",
+        observations: mobile.default
       },
       {
         id: "layout-right-sidebar-resize-desktop",
-        status: desktop.rightResize?.pass ? "pass" : "blocked",
-        viewport: desktop.rightResize?.viewport ?? desktop.expanded.viewport,
+        status: desktop.rightResize.pass ? "pass" : "blocked",
+        viewport: desktop.rightResize.viewport ?? desktop.default.viewport,
         summary: "Desktop right hardware sidebar resize supports pointer drag, keyboard bounds, localStorage v1 restore, and keeps Code Agent plus M3 controls reachable.",
         observations: desktop.rightResize
       },
       {
         id: "layout-right-sidebar-resize-narrow-desktop",
-        status: narrowDesktop.rightResize?.pass ? "pass" : "blocked",
-        viewport: narrowDesktop.rightResize?.viewport ?? narrowDesktop.expanded.viewport,
+        status: narrowDesktop.rightResize.pass ? "pass" : "blocked",
+        viewport: narrowDesktop.rightResize.viewport ?? narrowDesktop.default.viewport,
         summary: "Narrow desktop disables the right-sidebar drag handle while the stacked M3 hardware area remains reachable without outer page scroll.",
         observations: narrowDesktop.rightResize
       },
       {
         id: "layout-right-sidebar-resize-mobile",
-        status: mobile.rightResize?.pass ? "pass" : "blocked",
-        viewport: mobile.rightResize?.viewport ?? mobile.collapsed.viewport,
+        status: mobile.rightResize.pass ? "pass" : "blocked",
+        viewport: mobile.rightResize.viewport ?? mobile.default.viewport,
         summary: "Mobile disables the right-sidebar drag handle so it cannot cover M3 tabs, Code Agent input, or the hardware status area.",
         observations: mobile.rightResize
       },
@@ -2004,7 +1944,7 @@ function textHasForbiddenTerm(text, term) {
 function hasCompletePrimaryNavigation(html) {
   const navLabelsPresent =
     ["工作台", "内部复核", "使用说明"].every((label) => html.includes(`>${label}<`)) &&
-    />(?:资源树|收起资源树|展开资源树)<\/button>/u.test(html);
+    !/>(?:资源树|收起资源树|展开资源树)<\/button>/u.test(html);
   const legacyLabelsAbsent = incompletePrimaryNavLabels.every((label) => !html.includes(`>${label}<`));
   const noLeftSideRecordsShortcut = !/data-side-tab-jump=["']records["']/u.test(html);
   return navLabelsPresent && legacyLabelsAbsent && noLeftSideRecordsShortcut;
@@ -2181,62 +2121,67 @@ function hasScrollLockContract(styles) {
     /body\s*>\s*\[data-app-shell\]\s*\{[^\}]*min-height:\s*0;/su.test(styles) &&
     /\.workbench-shell\s*\{[^\}]*height:\s*100(?:d)?vh;[^\}]*overflow:\s*hidden;/su.test(styles) &&
     /\.view\s*\{[^\}]*min-height:\s*0;[^\}]*overflow:\s*auto;/su.test(styles) &&
-    /\.(?:resource-tree|compact-list|conversation-list|task-list|hardware-list)[^\{]*\{[^\}]*min-height:\s*0;[^\}]*overflow:\s*auto;/su.test(styles)
+    /\.(?:compact-list|conversation-list|task-list|hardware-list)[^\{]*\{[^\}]*min-height:\s*0;[^\}]*overflow:\s*auto;/su.test(styles)
   );
 }
 
 function hasMobileWorkbenchLayoutContract({ html, app, styles }) {
   return (
-    /id=["']resource-explorer["']/u.test(html) &&
-    /aria-controls=["']resource-explorer["']/u.test(html) &&
-    /aria-expanded=["']true["']/u.test(html) &&
-    /aria-pressed=["']false["']/u.test(html) &&
-    /function\s+syncMobileExplorer\s*\(/u.test(app) &&
-    /window\.matchMedia\(["']\(max-width:\s*860px\)["']\)/u.test(app) &&
-    /setExplorerCollapsed\(true\)/u.test(app) &&
-    /setExplorerCollapsed\(false\)/u.test(app) &&
-    /function\s+collapseExplorerAfterMobileAction\s*\(/u.test(app) &&
-    /aria-expanded/u.test(functionBody(app, "setExplorerCollapsed")) &&
-    /aria-label/u.test(functionBody(app, "setExplorerCollapsed")) &&
-    /展开资源树/u.test(functionBody(app, "setExplorerCollapsed")) &&
-    /\.explorer-collapsed\s+\.explorer\s*\{[^\}]*pointer-events:\s*none;/su.test(styles) &&
+    !/id=["']resource-explorer["']/u.test(html) &&
+    !/id=["']explorer-toggle["']/u.test(html) &&
+    !/id=["']explorer-resize["']/u.test(html) &&
+    !/function\s+syncMobileExplorer\s*\(/u.test(app) &&
+    !/function\s+setExplorerCollapsed\s*\(/u.test(app) &&
+    !/function\s+collapseExplorerAfterMobileAction\s*\(/u.test(app) &&
     /@media\s*\(max-width:\s*860px\)[\s\S]*?\.activity-rail\s*\{[\s\S]*?grid-row:\s*1\s*\/\s*3;/u.test(styles) &&
-    /@media\s*\(max-width:\s*860px\)[\s\S]*?\.explorer\s*\{[\s\S]*?grid-row:\s*1\s*\/\s*3;[\s\S]*?z-index:\s*4;/u.test(styles) &&
     /@media\s*\(max-width:\s*860px\)[\s\S]*?\.center-workspace\s*\{[\s\S]*?grid-row:\s*1;/u.test(styles) &&
     /@media\s*\(max-width:\s*860px\)[\s\S]*?\.right-sidebar\s*\{[\s\S]*?grid-row:\s*2;/u.test(styles) &&
     /@media\s*\(max-width:\s*520px\)[\s\S]*?\.command-bar\s*\{[\s\S]*?grid-template-columns:\s*minmax\(0,\s*1fr\)\s+auto\s+auto;/u.test(styles)
   );
 }
 
-function hasSidebarCollapseContract({ html, app, styles }) {
-  const setCollapsedBody = functionBody(app, "setExplorerCollapsed");
+function hasResourceExplorerRemovalContract({ html, app, styles }) {
+  const source = `${html}\n${app}\n${styles}`;
+  const removedSelectorsAbsent = [
+    "resource-explorer",
+    "explorer-toggle",
+    "explorer-resize",
+    "resource-tree",
+    "explorer-capabilities",
+    "capability-count",
+    "tree-count",
+    "data-focus-command",
+    "quick-actions",
+    "tree-panel",
+    "explorer-collapsed",
+    "--explorer-width",
+    "--explorer-min-width",
+    "--explorer-max-width"
+  ].every((term) => !source.includes(term));
+  const removedTextAbsent = [
+    "资源浏览与硬件资源树",
+    "只读工作区",
+    "常用能力",
+    "收起资源树",
+    "展开资源树",
+    "拖拽调整左侧资源树宽度",
+    "资源查看",
+    "查看接线",
+    "查看状态",
+    "编写任务"
+  ].every((term) => !source.includes(term));
   return (
-    /id=["']explorer-toggle["']/u.test(html) &&
-    /aria-label=["']收起左侧资源树["']/u.test(html) &&
-    /title=["']收起左侧资源树，给工作区更多宽度["']/u.test(html) &&
-    />收起资源树<\/button>/u.test(html) &&
-    /id=["']explorer-resize["']/u.test(html) &&
-    /role=["']separator["']/u.test(html) &&
-    /aria-label=["']拖拽调整左侧资源树宽度["']/u.test(html) &&
-    /aria-valuemin=["']220["']/u.test(html) &&
-    /aria-valuemax=["']420["']/u.test(html) &&
-    /aria-valuenow=["']292["']/u.test(html) &&
+    removedSelectorsAbsent &&
+    removedTextAbsent &&
     /LAYOUT_STORAGE_KEY\s*=\s*["']hwlab\.workbench\.layout\.v1["']/u.test(app) &&
-    /function\s+initExplorerResize\s*\(/u.test(app) &&
-    /function\s+clampExplorerWidth\s*\(/u.test(app) &&
     /setPointerCapture/u.test(app) &&
     /localStorage\?\.setItem\(\s*LAYOUT_STORAGE_KEY/u.test(app) &&
     /event\.key === "Home"/u.test(app) &&
     /event\.key === "End"/u.test(app) &&
     /ArrowLeft/u.test(app) &&
     /ArrowRight/u.test(app) &&
-    /setAttribute\("aria-hidden", resizeDisabled \? "true" : "false"\)/u.test(setCollapsedBody) &&
-    /setAttribute\("aria-label", collapsed \? "展开左侧资源树" : "收起左侧资源树"\)/u.test(setCollapsedBody) &&
-    /textContent = collapsed \? "展开资源树" : "收起资源树"/u.test(setCollapsedBody) &&
-    /title = collapsed \? "展开左侧资源树，恢复导航和硬件资源" : "收起左侧资源树，给工作区更多宽度"/u.test(setCollapsedBody) &&
-    /--explorer-width:\s*292px/u.test(styles) &&
-    /--explorer-min-width:\s*220px/u.test(styles) &&
-    /--explorer-max-width:\s*420px/u.test(styles) &&
+    /\.workbench-shell\s*\{[^}]*grid-template-columns:\s*var\(--rail-width\)\s+minmax\(420px,\s*1fr\)\s+var\(--right-width-expanded\);/su.test(styles) &&
+    /@media\s*\(max-width:\s*1240px\)[\s\S]*?\.workbench-shell\s*\{[\s\S]*?grid-template-columns:\s*var\(--rail-width\)\s+minmax\(0,\s*1fr\);/u.test(styles) &&
     /id=["']hardware-sidebar["']/u.test(html) &&
     /id=["']right-sidebar-resize["']/u.test(html) &&
     /aria-label=["']拖拽调整右侧硬件状态栏宽度["']/u.test(html) &&
@@ -2256,12 +2201,8 @@ function hasSidebarCollapseContract({ html, app, styles }) {
     /--right-sidebar-max-width:\s*760px/u.test(styles) &&
     /--right-width:\s*clamp\(var\(--right-sidebar-min-width\),\s*var\(--right-sidebar-width\),\s*var\(--right-sidebar-max-width\)\)/u.test(styles) &&
     /--right-width-expanded:\s*clamp\(var\(--right-sidebar-min-width\),\s*var\(--right-sidebar-width\),\s*var\(--right-sidebar-max-width\)\)/u.test(styles) &&
-    /\.explorer-resize\s*\{[^}]*cursor:\s*col-resize;/su.test(styles) &&
     /\.right-sidebar-resize\s*\{[^}]*cursor:\s*col-resize;/su.test(styles) &&
-    /\.explorer-collapsed\s+\.explorer-resize\s*\{[^}]*display:\s*none;/su.test(styles) &&
-    /@media\s*\(max-width:\s*860px\)[\s\S]*?\.explorer-resize\s*\{[\s\S]*?display:\s*none;/u.test(styles) &&
     /@media\s*\(max-width:\s*1240px\)[\s\S]*?\.right-sidebar-resize\s*\{[\s\S]*?display:\s*none;/u.test(styles) &&
-    /\.explorer-collapsed\s*\{[^}]*--explorer-width:\s*0px;[^}]*grid-template-columns:\s*var\(--rail-width\)\s+0\s+minmax\(420px,\s*1fr\)\s+var\(--right-width\);/su.test(styles) &&
     /\.side-panel\s*\{[^}]*overflow:\s*auto;[^}]*overscroll-behavior:\s*contain;/su.test(styles)
   );
 }
@@ -2269,7 +2210,7 @@ function hasSidebarCollapseContract({ html, app, styles }) {
 function hasStableRouteControls({ html, styles }) {
   return (
     ["工作台", "内部复核", "使用说明", "控制", "接线", "可信记录"].every((label) => html.includes(`>${label}<`)) &&
-    />(?:资源树|收起资源树|展开资源树)<\/button>/u.test(html) &&
+    !/>(?:资源树|收起资源树|展开资源树)<\/button>/u.test(html) &&
     /\.rail-button\s*\{[^}]*min-width:\s*0;[^}]*min-height:\s*36px;[^}]*text-align:\s*center;[^}]*word-break:\s*keep-all;/su.test(styles) &&
     /@media\s*\(max-width:\s*860px\)[\s\S]*?\.rail-button\s*\{[\s\S]*?min-height:\s*42px;/u.test(styles) &&
     /\.side-tab\s*\{[^}]*min-width:\s*0;[^}]*min-height:\s*34px;[^}]*overflow-wrap:\s*anywhere;[^}]*word-break:\s*keep-all;/su.test(styles) &&
@@ -3031,9 +2972,9 @@ async function inspectLiveDom(url, options = {}) {
         firstViewportForbiddenPresent: forbiddenTerms.filter((term) => textHasForbiddenTerm(firstViewportText, term)),
         firstViewportTextSample: firstViewportText.slice(0, 400),
         labelsPresent: ["硬件资源", "Agent 对话", "工作清单", "可信记录", "使用说明"].every((label) => text.includes(label)),
-        navLabelsPresent: ["工作台", "内部复核", "使用说明", "资源树"].every((label) =>
+        navLabelsPresent: ["工作台", "内部复核", "使用说明"].every((label) =>
           [...document.querySelectorAll(".activity-rail button")].some((button) => button.textContent?.trim() === label)
-        ),
+        ) && ![...document.querySelectorAll(".activity-rail button")].some((button) => /资源树|收起资源树|展开资源树/u.test(button.textContent?.trim() ?? "")),
         defaultBackstageHidden: !/(Gate|诊断|验收|BLOCKED|M0-M5|执行轨迹)/u.test(document.querySelector(".center-workspace")?.innerText ?? ""),
         gateRouteAvailable: [...document.querySelectorAll("[data-route='gate']")].some((button) => button.textContent?.trim() === "内部复核"),
         wiringLayout: document.querySelector(".wiring-table-wrap")?.getAttribute("data-wiring-layout") ?? "",
@@ -4181,7 +4122,7 @@ export async function runDevCloudWorkbenchMobileSmoke() {
       isMobile: true
     });
     await page.goto(server.url, { waitUntil: "networkidle", timeout: 15000 });
-    const closed = await inspectMobileWorkbench(page, { explorerOpen: false });
+    const closed = await inspectMobileWorkbench(page);
     const workspaceScroll = await inspectWorkbenchScrollContract(page, { panelSelector: "#conversation-list" });
     await page.click('[data-route="help"]');
     await page.waitForFunction(() => document.querySelector("#help-content")?.dataset.helpState === "ready", null, { timeout: 8000 });
@@ -4194,10 +4135,6 @@ export async function runDevCloudWorkbenchMobileSmoke() {
     const directHelp = await inspectHelpMarkdownRoute(page);
     await page.click('[data-route="workspace"]');
     await page.waitForFunction(() => document.querySelector('[data-view="workspace"]')?.hidden === false, null, { timeout: 8000 });
-    await page.click("#explorer-toggle");
-    const open = await inspectMobileWorkbench(page, { explorerOpen: true });
-    await page.click('[data-side-tab-jump="wiring"]');
-    const afterQuickAction = await inspectMobileWorkbench(page, { explorerOpen: false });
     const checks = [
       {
         id: "mobile-default-workbench",
@@ -4208,7 +4145,7 @@ export async function runDevCloudWorkbenchMobileSmoke() {
           workspaceHidden: closed.workspaceHidden,
           gateHidden: closed.gateHidden,
           helpHidden: closed.helpHidden,
-          explorerCollapsed: closed.explorerCollapsed,
+          removedSelectors: closed.removedSelectors,
           visibleText: closed.visibleText
         }
       },
@@ -4246,30 +4183,18 @@ export async function runDevCloudWorkbenchMobileSmoke() {
       {
         id: "mobile-default-hit-test",
         status: closed.primaryControlsReachable ? "pass" : "blocked",
-        summary: "Primary workbench controls are center-click reachable with the resource tree closed.",
+        summary: "Primary workbench controls are center-click reachable without a resource tree drawer.",
         observations: {
           reachable: closed.reachable,
           blocked: closed.blocked
         }
       },
       {
-        id: "mobile-resource-drawer-hit-test",
-        status: open.resourceControlsReachable ? "pass" : "blocked",
-        summary: "Opened resource drawer keeps quick actions and resource rows center-click reachable.",
+        id: "mobile-resource-explorer-removed",
+        status: closed.resourceExplorerRemoved ? "pass" : "blocked",
+        summary: "390x844 default DOM has no resource explorer, explorer resize handle, quick actions, or resource tree.",
         observations: {
-          drawer: open.drawer,
-          reachable: open.reachable,
-          blocked: open.blocked
-        }
-      },
-      {
-        id: "mobile-resource-action-collapse",
-        status: afterQuickAction.resourceActionCollapsed ? "pass" : "blocked",
-        summary: "Mobile resource quick actions collapse the drawer so the target workspace panel remains reachable.",
-        observations: {
-          explorerCollapsed: afterQuickAction.explorerCollapsed,
-          wiringSelected: afterQuickAction.wiringSelected,
-          tabHit: afterQuickAction.reachable.find((target) => target.label === "接线")
+          removedSelectors: closed.removedSelectors
         }
       }
     ];
@@ -5391,8 +5316,8 @@ function contentTypeFor(filePath) {
   return "application/octet-stream";
 }
 
-async function inspectMobileWorkbench(page, { explorerOpen }) {
-  return page.evaluate(async ({ explorerOpen }) => {
+async function inspectMobileWorkbench(page) {
+  return page.evaluate(async () => {
     function visibleTextFor(selector) {
       const element = document.querySelector(selector);
       return element?.textContent?.replace(/\s+/gu, " ").trim() ?? "";
@@ -5435,22 +5360,10 @@ async function inspectMobileWorkbench(page, { explorerOpen }) {
       }
       return inspectTarget(element, label);
     }
-    async function inspectScrollableTargets(selector) {
-      const targets = [...document.querySelectorAll(selector)];
-      const results = [];
-      for (const target of targets) {
-        target.scrollIntoView({ block: "center", inline: "nearest" });
-        await new Promise((resolve) => requestAnimationFrame(resolve));
-        results.push(inspectTarget(target));
-      }
-      return results;
-    }
-
     const defaultTargets = [
       inspectSelector('[data-route="workspace"]', "工作台"),
       inspectSelector('[data-route="gate"]', "内部复核"),
       inspectSelector('[data-route="help"]', "使用说明"),
-      inspectSelector("#explorer-toggle", "资源树"),
       inspectSelector("#command-input", "Agent 输入"),
       inspectSelector("#command-send", "发送"),
       inspectSelector("#command-clear", "清空"),
@@ -5458,33 +5371,31 @@ async function inspectMobileWorkbench(page, { explorerOpen }) {
       inspectSelector("#tab-wiring", "接线"),
       inspectSelector("#tab-records", "可信记录")
     ];
-    const drawerTargets = explorerOpen
-      ? [
-          ...[...document.querySelectorAll(".quick-actions button")].map((element) => inspectTarget(element)),
-          ...(await inspectScrollableTargets("#resource-tree summary, #resource-tree .tree-row"))
-        ]
-      : [];
-    const reachable = explorerOpen ? drawerTargets : defaultTargets;
+    const reachable = defaultTargets;
     const blocked = reachable.filter((target) => !target.ok);
     const text = document.body.textContent ?? "";
     const workspace = document.querySelector('[data-view="workspace"]');
     const gate = document.querySelector('[data-view="gate"]');
     const help = document.querySelector('[data-view="help"]');
-    const shell = document.querySelector("[data-app-shell]");
-    const drawer = boxFor("#resource-explorer");
+    const removedSelectors = {
+      resourceExplorer: document.querySelector("#resource-explorer") === null,
+      explorerResize: document.querySelector("#explorer-resize") === null,
+      explorerToggle: document.querySelector("#explorer-toggle") === null,
+      quickActions: document.querySelector(".quick-actions") === null,
+      resourceTree: document.querySelector("#resource-tree") === null
+    };
     return {
       title: document.title,
       workspaceHidden: workspace ? workspace.hidden : null,
       gateHidden: gate ? gate.hidden : null,
       helpHidden: help ? help.hidden : null,
-      explorerCollapsed: shell?.classList.contains("explorer-collapsed") ?? null,
+      removedSelectors,
       visibleText: {
         bodyHasWorkbench: text.includes("用户工作台") && text.includes("Agent 对话"),
         gateIsSecondaryLabel: text.includes("内部复核"),
         helpIsSecondaryLabel: text.includes("使用说明"),
         visibleWorkspaceText: visibleTextFor(".center-workspace").slice(0, 160)
       },
-      drawer,
       defaultWorkbenchReachable:
         document.title === "HWLAB 云工作台" &&
         workspace?.hidden === false &&
@@ -5495,16 +5406,12 @@ async function inspectMobileWorkbench(page, { explorerOpen }) {
         text.includes("内部复核") &&
         text.includes("使用说明"),
       primaryControlsReachable: defaultTargets.every((target) => target.ok),
-      resourceControlsReachable: drawerTargets.length >= 8 && drawerTargets.every((target) => target.ok),
-      resourceActionCollapsed:
-        !explorerOpen &&
-        shell?.classList.contains("explorer-collapsed") === true &&
-        document.querySelector("#tab-wiring")?.getAttribute("aria-selected") === "true",
+      resourceExplorerRemoved: Object.values(removedSelectors).every(Boolean),
       wiringSelected: document.querySelector("#tab-wiring")?.getAttribute("aria-selected") === "true",
       reachable,
       blocked
     };
-  }, { explorerOpen });
+  });
 }
 
 async function inspectWorkbenchLayoutViewport(browser, url, viewport, options = {}) {
@@ -5516,70 +5423,19 @@ async function inspectWorkbenchLayoutViewport(browser, url, viewport, options =
   const artifacts = { screenshots: [] };
   try {
     await page.goto(url, { waitUntil: "domcontentloaded", timeout: 15000 });
-    await page.locator("#explorer-toggle").waitFor({ state: "visible", timeout: 12000 });
+    await page.locator("#command-input").waitFor({ state: "visible", timeout: 12000 });
     await page.waitForTimeout(150);
-    if (viewport.isMobile) {
-      const collapsed = await inspectLayoutState(page, {
-        mode: "mobile-collapsed",
-        viewport,
-        compareTo: null
-      });
-      artifacts.screenshots.push(...await captureLayoutScreenshots(page, options.artifactRoot, viewport, "mobile-collapsed"));
-      await page.locator("#explorer-toggle").click();
-      await page.waitForFunction(() => !document.querySelector("[data-app-shell]")?.classList.contains("explorer-collapsed"), null, { timeout: 8000 });
-      const drawer = await inspectLayoutState(page, {
-        mode: "mobile-drawer",
-        viewport,
-        compareTo: collapsed
-      });
-      artifacts.screenshots.push(...await captureLayoutScreenshots(page, options.artifactRoot, viewport, "mobile-drawer"));
-      await page.locator("#explorer-toggle").click();
-      await page.waitForFunction(() => document.querySelector("[data-app-shell]")?.classList.contains("explorer-collapsed"), null, { timeout: 8000 });
-      const recollapsed = await inspectLayoutState(page, {
-        mode: "mobile-recollapsed",
-        viewport,
-        compareTo: collapsed
-      });
-      drawer.recollapsed = {
-        explorerCollapsed: recollapsed.explorerCollapsed,
-        toggleText: recollapsed.toggle.text,
-        toggleAriaLabel: recollapsed.toggle.ariaLabel,
-        keyTargetsReachable: recollapsed.keyTargetsReachable
-      };
-      drawer.pass = drawer.pass && recollapsed.explorerCollapsed === true && recollapsed.keyTargetsReachable;
-      const resize = await inspectExplorerResizeMobile(page, { viewport });
-      const rightResize = await inspectRightSidebarResizeDisabled(page, { viewport });
-      const gate = await inspectWorkbenchGateLayout(browser, url, viewport, options);
-      return { collapsed, drawer, resize, rightResize, gate, artifacts };
-    }
-
-    const expanded = await inspectLayoutState(page, {
-      mode: "desktop-expanded",
+    const defaultLayout = await inspectLayoutState(page, {
+      mode: viewport.isMobile ? "mobile-default" : viewport.width <= 1240 ? "narrow-desktop-default" : "desktop-default",
       viewport,
       compareTo: null
     });
-    artifacts.screenshots.push(...await captureLayoutScreenshots(page, options.artifactRoot, viewport, "desktop-expanded"));
-    await page.locator("#explorer-toggle").click();
-    await page.waitForFunction(() => document.querySelector("[data-app-shell]")?.classList.contains("explorer-collapsed"), null, { timeout: 8000 });
-    const collapsed = await inspectLayoutState(page, {
-      mode: "desktop-collapsed",
-      viewport,
-      compareTo: expanded
-    });
-    artifacts.screenshots.push(...await captureLayoutScreenshots(page, options.artifactRoot, viewport, "desktop-collapsed"));
-    await page.locator("#explorer-toggle").click();
-    await page.waitForFunction(() => !document.querySelector("[data-app-shell]")?.classList.contains("explorer-collapsed"), null, { timeout: 8000 });
-    const restored = await inspectLayoutState(page, {
-      mode: "desktop-restored",
-      viewport,
-      compareTo: expanded
-    });
-    const resize = await inspectExplorerResizeDesktop(page, { viewport });
+    artifacts.screenshots.push(...await captureLayoutScreenshots(page, options.artifactRoot, viewport, defaultLayout.mode));
     const rightResize = viewport.width > 1240
       ? await inspectRightSidebarResizeDesktop(page, { viewport })
       : await inspectRightSidebarResizeDisabled(page, { viewport });
     const gate = await inspectWorkbenchGateLayout(browser, url, viewport, options);
-    return { expanded, collapsed, restored, resize, rightResize, gate, artifacts };
+    return { default: defaultLayout, rightResize, gate, artifacts };
   } finally {
     await page.close();
   }
@@ -5605,295 +5461,6 @@ async function inspectWorkbenchGateLayout(browser, url, viewport, options = {})
   }
 }
 
-async function inspectExplorerResizeDesktop(page, { viewport }) {
-  const before = await page.evaluate(() => {
-    const shell = document.querySelector("[data-app-shell]");
-    const explorer = document.querySelector("#resource-explorer");
-    const center = document.querySelector(".center-workspace");
-    const right = document.querySelector(".right-sidebar");
-    const handle = document.querySelector("#explorer-resize");
-    return {
-      explorerWidth: explorer?.getBoundingClientRect().width ?? 0,
-      centerWidth: center?.getBoundingClientRect().width ?? 0,
-      rightWidth: right?.getBoundingClientRect().width ?? 0,
-      cssWidth: Number.parseFloat(getComputedStyle(shell).getPropertyValue("--explorer-width")),
-      storage: localStorage.getItem("hwlab.workbench.layout.v1"),
-      handle: {
-        ariaLabel: handle?.getAttribute("aria-label") ?? "",
-        title: handle?.getAttribute("title") ?? "",
-        role: handle?.getAttribute("role") ?? "",
-        tabIndex: handle?.tabIndex ?? null,
-        valueMin: handle?.getAttribute("aria-valuemin") ?? "",
-        valueMax: handle?.getAttribute("aria-valuemax") ?? "",
-        valueNow: handle?.getAttribute("aria-valuenow") ?? "",
-        valueText: handle?.getAttribute("aria-valuetext") ?? ""
-      }
-    };
-  });
-  const min = Number(before.handle.valueMin);
-  const max = Number(before.handle.valueMax);
-  const growTarget = Math.min(max, before.explorerWidth + 72);
-  const shrinkTarget = Math.max(min, before.explorerWidth - 48);
-  const dragTarget = growTarget - before.explorerWidth >= 32 ? growTarget : shrinkTarget;
-  await dragExplorerResizeHandle(page, dragTarget);
-  const afterDrag = await explorerResizeMetrics(page);
-  await page.locator("#explorer-resize").press("ArrowLeft");
-  const afterArrowLeft = await explorerResizeMetrics(page);
-  await page.locator("#explorer-resize").press("End");
-  const afterEnd = await explorerResizeMetrics(page);
-  await page.locator("#explorer-resize").press("Home");
-  const afterHome = await explorerResizeMetrics(page);
-  await page.locator("#explorer-resize").press("ArrowRight");
-  const afterArrowRight = await explorerResizeMetrics(page);
-  await page.locator("#explorer-toggle").click();
-  await page.waitForFunction(() => document.querySelector("[data-app-shell]")?.classList.contains("explorer-collapsed"), null, { timeout: 8000 });
-  const collapsed = await explorerResizeMetrics(page);
-  await page.locator("#explorer-toggle").click();
-  await page.waitForFunction(() => !document.querySelector("[data-app-shell]")?.classList.contains("explorer-collapsed"), null, { timeout: 8000 });
-  const restored = await explorerResizeMetrics(page);
-  await page.reload({ waitUntil: "domcontentloaded", timeout: 15000 });
-  await page.locator("#explorer-toggle").waitFor({ state: "visible", timeout: 12000 });
-  await page.waitForTimeout(150);
-  const restoredFromStorage = await explorerResizeMetrics(page);
-  const expectedArrow = Math.min(afterHome.bounds.max, afterHome.bounds.min + 16);
-  const pass =
-    before.handle.role === "separator" &&
-    before.handle.ariaLabel === "拖拽调整左侧资源树宽度" &&
-    before.handle.title.includes("左右方向键") &&
-    before.handle.tabIndex === 0 &&
-    Number.isFinite(min) &&
-    Number.isFinite(max) &&
-    max >= min &&
-    Math.abs(afterDrag.explorerWidth - before.explorerWidth) >= 24 &&
-    afterDrag.explorerWidth >= min &&
-    afterDrag.explorerWidth <= max &&
-    afterArrowLeft.explorerWidth <= afterDrag.explorerWidth - 12 &&
-    Math.abs(afterEnd.explorerWidth - afterEnd.bounds.max) <= 2 &&
-    Math.abs(afterHome.explorerWidth - afterHome.bounds.min) <= 2 &&
-    Math.abs(afterArrowRight.explorerWidth - expectedArrow) <= 2 &&
-    collapsed.explorerCollapsed === true &&
-    collapsed.explorerWidth <= 1 &&
-    collapsed.handleTabIndex === -1 &&
-    Math.abs(restored.explorerWidth - afterArrowRight.explorerWidth) <= 2 &&
-    restored.storage?.version === 1 &&
-    restored.storage?.explorerWidth === afterArrowRight.explorerWidth &&
-    Math.abs(restoredFromStorage.explorerWidth - afterArrowRight.explorerWidth) <= 2 &&
-    restoredFromStorage.keyTargetsReachable &&
-    restoredFromStorage.rootScrollLocked &&
-    restoredFromStorage.noHorizontalOverflow;
-  return {
-    viewport,
-    pass,
-    targetWidth: dragTarget,
-    before,
-    afterDrag,
-    afterArrowLeft,
-    afterEnd,
-    afterHome,
-    afterArrowRight,
-    collapsed,
-    restored,
-    restoredFromStorage
-  };
-}
-
-async function dragExplorerResizeHandle(page, targetWidth) {
-  const start = await page.evaluate(() => {
-    const explorer = document.querySelector("#resource-explorer");
-    const handle = document.querySelector("#explorer-resize");
-    const explorerBox = explorer.getBoundingClientRect();
-    const handleBox = handle.getBoundingClientRect();
-    return {
-      startX: handleBox.left + handleBox.width / 2,
-      startY: handleBox.top + Math.min(80, handleBox.height / 2),
-      currentWidth: explorerBox.width
-    };
-  });
-  const targetX = start.startX + targetWidth - start.currentWidth;
-  await page.mouse.move(start.startX, start.startY);
-  await page.mouse.down();
-  await page.mouse.move(targetX, start.startY, { steps: 8 });
-  await page.mouse.up();
-}
-
-async function explorerResizeMetrics(page) {
-  return page.evaluate(async () => {
-    const shell = document.querySelector("[data-app-shell]");
-    const explorer = document.querySelector("#resource-explorer");
-    const center = document.querySelector(".center-workspace");
-    const right = document.querySelector(".right-sidebar");
-    const handle = document.querySelector("#explorer-resize");
-    const ownsHit = (element, hit) => hit === element || element.contains(hit);
-    const hitLabel = (hit) => hit ? `${hit.tagName.toLowerCase()}${hit.id ? `#${hit.id}` : ""}${hit.className ? `.${String(hit.className).trim().replace(/\s+/gu, ".")}` : ""}` : "none";
-    const nearestScrollableAncestor = (element) => {
-      let current = element.parentElement;
-      while (current && current !== document.documentElement) {
-        const style = getComputedStyle(current);
-        const scrollable = current.scrollHeight > current.clientHeight + 2 && !["visible", "clip"].includes(style.overflowY);
-        if (scrollable) return current;
-        current = current.parentElement;
-      }
-      return null;
-    };
-    const scrollIntoNearestContainer = async (element) => {
-      const container = nearestScrollableAncestor(element);
-      if (!container) {
-        element.scrollIntoView({ block: "center", inline: "nearest" });
-        await new Promise((resolve) => requestAnimationFrame(resolve));
-        return null;
-      }
-      const elementBox = element.getBoundingClientRect();
-      const containerBox = container.getBoundingClientRect();
-      const inset = Math.max(6, Math.min(24, (container.clientHeight - Math.min(elementBox.height, container.clientHeight)) / 2));
-      container.scrollTop += elementBox.top - containerBox.top - inset;
-      await new Promise((resolve) => requestAnimationFrame(resolve));
-      return container;
-    };
-    const clipBoxForElement = (element) => {
-      let visible = {
-        left: 0,
-        top: 0,
-        right: window.innerWidth,
-        bottom: window.innerHeight
-      };
-      let current = element.parentElement;
-      while (current && current !== document.documentElement) {
-        const style = getComputedStyle(current);
-        if (!["visible", "clip"].includes(style.overflow) || !["visible", "clip"].includes(style.overflowY) || !["visible", "clip"].includes(style.overflowX)) {
-          const box = current.getBoundingClientRect();
-          visible = {
-            left: Math.max(visible.left, box.left),
-            top: Math.max(visible.top, box.top),
-            right: Math.min(visible.right, box.right),
-            bottom: Math.min(visible.bottom, box.bottom)
-          };
-        }
-        current = current.parentElement;
-      }
-      return visible;
-    };
-    const targetSelectors = [
-      "#command-input",
-      "#command-send",
-      "#m3-write-do",
-      "#m3-read-di",
-      "[data-hardware-tab='overview']",
-      "[data-hardware-tab='box1']",
-      "[data-hardware-tab='box2']",
-      "[data-hardware-tab='patch']"
-    ];
-    const keyTargets = [];
-    for (const selector of targetSelectors) {
-      const element = document.querySelector(selector);
-      if (!element) {
-        keyTargets.push({ selector, ok: false, missing: true });
-        continue;
-      }
-      const scrollContainer = await scrollIntoNearestContainer(element);
-      const box = element.getBoundingClientRect();
-      const clipBox = clipBoxForElement(element);
-      const visibleBox = {
-        left: Math.max(box.left, clipBox.left),
-        top: Math.max(box.top, clipBox.top),
-        right: Math.min(box.right, clipBox.right),
-        bottom: Math.min(box.bottom, clipBox.bottom)
-      };
-      const visibleWidth = Math.max(0, visibleBox.right - visibleBox.left);
-      const visibleHeight = Math.max(0, visibleBox.bottom - visibleBox.top);
-      const x = visibleBox.left + visibleWidth / 2;
-      const y = visibleBox.top + visibleHeight / 2;
-      const stack = document.elementsFromPoint(x, y);
-      keyTargets.push({
-        selector,
-        ok:
-          box.width > 0 &&
-          box.height > 0 &&
-          visibleWidth > 0 &&
-          visibleHeight > 0 &&
-          x >= 0 &&
-          x <= window.innerWidth &&
-          y >= 0 &&
-          y <= window.innerHeight &&
-          stack.some((candidate) => ownsHit(element, candidate)),
-        hit: hitLabel(stack[0] ?? null),
-        center: { x, y },
-        visibleBox,
-        scrollContainer: scrollContainer ? scrollContainer.id ? `#${scrollContainer.id}` : scrollContainer.className ? `.${String(scrollContainer.className).trim().replace(/\s+/gu, ".")}` : scrollContainer.tagName.toLowerCase() : null
-      });
-    }
-    let storage = null;
-    try {
-      storage = JSON.parse(localStorage.getItem("hwlab.workbench.layout.v1") ?? "null");
-    } catch {
-      storage = "parse_failed";
-    }
-    return {
-      explorerCollapsed: shell?.classList.contains("explorer-collapsed") === true,
-      explorerWidth: explorer?.getBoundingClientRect().width ?? 0,
-      centerWidth: center?.getBoundingClientRect().width ?? 0,
-      rightWidth: right?.getBoundingClientRect().width ?? 0,
-      cssWidth: Number.parseFloat(getComputedStyle(shell).getPropertyValue("--explorer-width")),
-      bounds: {
-        min: Number(handle?.getAttribute("aria-valuemin")),
-        max: Number(handle?.getAttribute("aria-valuemax"))
-      },
-      handleTabIndex: handle?.tabIndex ?? null,
-      handleAriaDisabled: handle?.getAttribute("aria-disabled") ?? "",
-      handleAriaHidden: handle?.getAttribute("aria-hidden") ?? "",
-      handleAriaValueNow: Number(handle?.getAttribute("aria-valuenow")),
-      handleAriaValueText: handle?.getAttribute("aria-valuetext") ?? "",
-      storage,
-      keyTargets,
-      keyTargetsReachable: keyTargets.every((target) => target.ok),
-      noHorizontalOverflow:
-        document.documentElement.scrollWidth <= document.documentElement.clientWidth + 2 &&
-        document.body.scrollWidth <= document.body.clientWidth + 2 &&
-        (!right || right.scrollWidth <= right.clientWidth + 2),
-      rootScrollLocked:
-        getComputedStyle(document.documentElement).overflow === "hidden" &&
-        getComputedStyle(document.body).overflow === "hidden" &&
-        document.documentElement.scrollHeight <= document.documentElement.clientHeight + 2 &&
-        document.body.scrollHeight <= document.body.clientHeight + 2
-    };
-  });
-}
-
-async function inspectExplorerResizeMobile(page, { viewport }) {
-  const observation = await page.evaluate(() => {
-    const handle = document.querySelector("#explorer-resize");
-    const box = handle?.getBoundingClientRect();
-    const style = handle ? getComputedStyle(handle) : null;
-    const shell = document.querySelector("[data-app-shell]");
-    const right = document.querySelector(".right-sidebar");
-    return {
-      viewport: { width: window.innerWidth, height: window.innerHeight },
-      explorerCollapsed: shell?.classList.contains("explorer-collapsed") === true,
-      handlePresent: Boolean(handle),
-      handleDisplay: style?.display ?? "missing",
-      handleWidth: box?.width ?? 0,
-      handleTabIndex: handle?.tabIndex ?? null,
-      handleAriaDisabled: handle?.getAttribute("aria-disabled") ?? "",
-      handleAriaHidden: handle?.getAttribute("aria-hidden") ?? "",
-      noHorizontalOverflow:
-        document.documentElement.scrollWidth <= document.documentElement.clientWidth + 2 &&
-        document.body.scrollWidth <= document.body.clientWidth + 2 &&
-        (!right || right.scrollWidth <= right.clientWidth + 2)
-    };
-  });
-  return {
-    viewport,
-    pass:
-      observation.explorerCollapsed === true &&
-      observation.handlePresent &&
-      observation.handleDisplay === "none" &&
-      observation.handleTabIndex === -1 &&
-      observation.handleAriaDisabled === "true" &&
-      observation.handleAriaHidden === "true" &&
-      observation.noHorizontalOverflow,
-    ...observation
-  };
-}
-
 async function inspectRightSidebarResizeDesktop(page, { viewport }) {
   const before = await page.evaluate(() => {
     const shell = document.querySelector("[data-app-shell]");
@@ -5932,12 +5499,6 @@ async function inspectRightSidebarResizeDesktop(page, { viewport }) {
   const afterHome = await rightSidebarResizeMetrics(page);
   await page.locator("#right-sidebar-resize").press("ArrowLeft");
   const afterArrowLeft = await rightSidebarResizeMetrics(page);
-  await page.locator("#explorer-toggle").click();
-  await page.waitForFunction(() => document.querySelector("[data-app-shell]")?.classList.contains("explorer-collapsed"), null, { timeout: 8000 });
-  const collapsedLeft = await rightSidebarResizeMetrics(page);
-  await page.locator("#explorer-toggle").click();
-  await page.waitForFunction(() => !document.querySelector("[data-app-shell]")?.classList.contains("explorer-collapsed"), null, { timeout: 8000 });
-  const restoredLeft = await rightSidebarResizeMetrics(page);
   await page.reload({ waitUntil: "domcontentloaded", timeout: 15000 });
   await page.locator("#right-sidebar-resize").waitFor({ state: "visible", timeout: 12000 });
   await page.waitForTimeout(150);
@@ -5958,12 +5519,8 @@ async function inspectRightSidebarResizeDesktop(page, { viewport }) {
     Math.abs(afterEnd.rightWidth - afterEnd.bounds.max) <= 2 &&
     Math.abs(afterHome.rightWidth - afterHome.bounds.min) <= 2 &&
     Math.abs(afterArrowLeft.rightWidth - expectedArrowLeft) <= 2 &&
-    collapsedLeft.leftExplorerCollapsed === true &&
-    collapsedLeft.handleTabIndex === 0 &&
-    collapsedLeft.keyTargetsReachable &&
-    Math.abs(restoredLeft.rightWidth - afterArrowLeft.rightWidth) <= 2 &&
-    restoredLeft.storage?.version === 1 &&
-    restoredLeft.storage?.rightSidebarWidth === afterArrowLeft.rightWidth &&
+    afterArrowLeft.storage?.version === 1 &&
+    afterArrowLeft.storage?.rightSidebarWidth === afterArrowLeft.rightWidth &&
     Math.abs(restoredFromStorage.rightWidth - afterArrowLeft.rightWidth) <= 2 &&
     restoredFromStorage.keyTargetsReachable &&
     restoredFromStorage.rootScrollLocked &&
@@ -5978,8 +5535,6 @@ async function inspectRightSidebarResizeDesktop(page, { viewport }) {
     afterEnd,
     afterHome,
     afterArrowLeft,
-    collapsedLeft,
-    restoredLeft,
     restoredFromStorage
   };
 }
@@ -6006,7 +5561,6 @@ async function dragRightSidebarResizeHandle(page, targetWidth) {
 async function rightSidebarResizeMetrics(page) {
   return page.evaluate(async () => {
     const shell = document.querySelector("[data-app-shell]");
-    const explorer = document.querySelector("#resource-explorer");
     const center = document.querySelector(".center-workspace");
     const right = document.querySelector("#hardware-sidebar");
     const handle = document.querySelector("#right-sidebar-resize");
@@ -6118,8 +5672,9 @@ async function rightSidebarResizeMetrics(page) {
       storage = "parse_failed";
     }
     return {
-      leftExplorerCollapsed: shell?.classList.contains("explorer-collapsed") === true,
-      explorerWidth: explorer?.getBoundingClientRect().width ?? 0,
+      resourceExplorerPresent: Boolean(document.querySelector("#resource-explorer")),
+      explorerResizePresent: Boolean(document.querySelector("#explorer-resize")),
+      explorerTogglePresent: Boolean(document.querySelector("#explorer-toggle")),
       centerWidth: center?.getBoundingClientRect().width ?? 0,
       rightWidth: right?.getBoundingClientRect().width ?? 0,
       cssWidth: Number.parseFloat(getComputedStyle(shell).getPropertyValue("--right-sidebar-width")),
@@ -6199,7 +5754,6 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
     const failures = [];
     const skip = [];
     const selectorLabels = [
-      ["#explorer-toggle", "资源树折叠按钮"],
       ["#command-input", "Code Agent 输入"],
       ["#command-send", "发送"],
       ["#m3-gateway-select", "M3 Gateway select"],
@@ -6240,11 +5794,6 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
       ["#command-form", ".right-sidebar", "Code Agent command form vs right sidebar"]
     ];
     const wiringLegacyHeaders = ["源设备", "源端口", "接线盘", "目标设备", "目标端口", "状态", "证据来源", "轨迹/证据"];
-    const drawerSelectorLabels = [
-      [".quick-actions button", "资源树快捷操作"],
-      ["#resource-tree summary", "资源树分组"],
-      ["#resource-tree .tree-row", "资源树资源行"]
-    ];
     const boxForElement = (element) => {
       if (!element) return null;
       const box = element.getBoundingClientRect();
@@ -6397,13 +5946,10 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
     await new Promise((resolve) => requestAnimationFrame(resolve));
 
     const shell = document.querySelector("[data-app-shell]");
-    const toggleElement = document.querySelector("#explorer-toggle");
     const isDesktop = viewport.width >= 861;
-    const isMobile = !isDesktop;
     const boxes = {
       shell: boxFor("[data-app-shell]"),
       rail: boxFor(".activity-rail"),
-      explorer: boxFor("#resource-explorer"),
       center: boxFor(".center-workspace"),
       right: boxFor(".right-sidebar"),
       commandBar: boxFor("#command-form"),
@@ -6454,33 +6000,16 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
     for (const [selector, label] of selectorLabels) {
       keyTargets.push(await inspectHitTarget(selector, label));
     }
-    const resizeHandle = await inspectHitTarget("#explorer-resize", "左侧资源树宽度调整手柄");
     const rightResizeHandle = await inspectHitTarget("#right-sidebar-resize", "右侧硬件状态栏宽度调整手柄");
-    const drawerTargets = [];
-    for (const [selector, label] of drawerSelectorLabels) {
-      drawerTargets.push(await inspectFirstHit(selector, label));
-    }
     const blockedKeyTargets = keyTargets.filter((target) => !target.ok);
-    const blockedDrawerTargets = drawerTargets.filter((target) => !target.ok);
-    const explorerCollapsed = shell?.classList.contains("explorer-collapsed") === true;
-    const explorerVisible = Boolean(
-      boxes.explorer &&
-      boxes.explorer.display !== "none" &&
-      boxes.explorer.visibility !== "hidden" &&
-      boxes.explorer.width > 1 &&
-      boxes.explorer.height > 1
-    );
-    const requireKeyTargets = !(isMobile && mode === "mobile-drawer");
-    if (requireKeyTargets) {
-      for (const target of blockedKeyTargets) {
-        failures.push({
-          failureType: target.missing ? "blocked/skip" : "covered-hit-target",
-          selector: target.selector,
-          viewport,
-          summary: `${target.label} is not center-click reachable; hit=${target.hit ?? "none"}`,
-          target
-        });
-      }
+    for (const target of blockedKeyTargets) {
+      failures.push({
+        failureType: target.missing ? "blocked/skip" : "covered-hit-target",
+        selector: target.selector,
+        viewport,
+        summary: `${target.label} is not center-click reachable; hit=${target.hit ?? "none"}`,
+        target
+      });
     }
     const centerWidthDelta = compareTo?.boxes?.center?.width && boxes.center
       ? boxes.center.width - compareTo.boxes.center.width
@@ -6490,7 +6019,6 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
       : null;
     const overlapChecks = {
       railCenter: boxesOverlap(boxes.rail, boxes.center, -1),
-      explorerCenter: explorerVisible && isDesktop && boxesOverlap(boxes.explorer, boxes.center, -1),
       centerRight: isDesktop && boxesOverlap(boxes.center, boxes.right, -1),
       m3ActionsControlList: boxesOverlap(boxes.m3Actions, boxes.controlList, -1),
       topbarCommandBar: boxesOverlap(boxes.topbar, boxes.commandBar, -1)
@@ -6667,119 +6195,24 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
       controlTab?.click();
       await new Promise((resolve) => requestAnimationFrame(resolve));
     }
-    const toggle = {
-      text: toggleElement?.textContent?.replace(/\s+/gu, " ").trim() ?? "",
-      ariaLabel: toggleElement?.getAttribute("aria-label") ?? "",
-      title: toggleElement?.getAttribute("title") ?? "",
-      ariaExpanded: toggleElement?.getAttribute("aria-expanded") ?? "",
-      ariaPressed: toggleElement?.getAttribute("aria-pressed") ?? ""
-    };
-    const collapsedWidthGain = isDesktop && mode === "desktop-collapsed"
-      ? centerWidthDelta !== null && centerWidthDelta >= 180
-      : true;
-    const restoredWidth = isDesktop && mode === "desktop-restored"
-      ? centerWidthDelta !== null && Math.abs(centerWidthDelta) <= 4
-      : true;
-    const drawerReachable = isMobile && mode === "mobile-drawer"
-      ? drawerTargets.length >= 3 && blockedDrawerTargets.length === 0
-      : true;
-    for (const target of isMobile && mode === "mobile-drawer" ? blockedDrawerTargets : []) {
-      failures.push({
-        failureType: target.missing ? "blocked/skip" : "covered-hit-target",
-        selector: target.selector,
-        viewport,
-        summary: `${target.label} drawer target is not reachable; hit=${target.hit ?? "none"}`,
-        target
-      });
-    }
-    const collapsedExpected = mode === "desktop-collapsed" || mode === "mobile-collapsed" || mode === "mobile-recollapsed";
-    const expandedExpected = mode === "desktop-expanded" || mode === "desktop-restored" || mode === "mobile-drawer";
-    const collapsedStateMatches = collapsedExpected
-      ? explorerCollapsed === true && toggle.ariaExpanded === "false" && toggle.ariaPressed === "true" && toggle.text === "展开资源树" && toggle.ariaLabel === "展开左侧资源树"
-      : expandedExpected
-        ? explorerCollapsed === false && toggle.ariaExpanded === "true" && toggle.ariaPressed === "false" && toggle.text === "收起资源树" && toggle.ariaLabel === "收起左侧资源树"
-        : true;
-    const explorerStateMatches = collapsedExpected
-      ? isDesktop
-        ? boxes.explorer !== null && boxes.explorer.width <= 1
-        : boxes.explorer?.display === "none"
-      : explorerVisible;
-    const defaultCollapsedMobile = mode === "mobile-collapsed"
-      ? explorerCollapsed === true
-      : true;
+    const removedSelectorStates = Object.fromEntries(
+      [
+        ["#resource-explorer", "resourceExplorer"],
+        ["#explorer-resize", "explorerResize"],
+        ["#explorer-toggle", "explorerToggle"],
+        ["#resource-tree", "resourceTree"],
+        [".quick-actions", "quickActions"]
+      ].map(([selector, key]) => [key, document.querySelector(selector) === null])
+    );
+    const removedSelectorsAbsent = Object.values(removedSelectorStates).every(Boolean);
     const keyTargetsReachable = blockedKeyTargets.length === 0;
-    const keyTargetsRequirement = requireKeyTargets ? keyTargetsReachable : true;
-    if (!collapsedStateMatches) {
-      failures.push({
-        failureType: "blocked/skip",
-        selector: "#explorer-toggle",
-        viewport,
-        summary: `Explorer toggle state/Chinese label mismatch in ${mode}: text=${toggle.text}, ariaLabel=${toggle.ariaLabel}, ariaExpanded=${toggle.ariaExpanded}, ariaPressed=${toggle.ariaPressed}.`,
-        toggle,
-        expected: collapsedExpected
-          ? {
-              explorerCollapsed: true,
-              text: "展开资源树",
-              ariaLabel: "展开左侧资源树",
-              ariaExpanded: "false",
-              ariaPressed: "true"
-            }
-          : {
-              explorerCollapsed: false,
-              text: "收起资源树",
-              ariaLabel: "收起左侧资源树",
-              ariaExpanded: "true",
-              ariaPressed: "false"
-            }
-      });
-    }
-    if (!explorerStateMatches) {
+    if (!removedSelectorsAbsent) {
       failures.push({
         failureType: "blocked/skip",
         selector: "#resource-explorer",
         viewport,
-        summary: `Explorer visibility did not match expected ${collapsedExpected ? "collapsed" : "expanded"} state in ${mode}.`,
-        explorerCollapsed,
-        explorerVisible,
-        explorerBox: boxes.explorer
-      });
-    }
-    if (!collapsedWidthGain) {
-      failures.push({
-        failureType: "overflow",
-        selector: ".center-workspace",
-        viewport,
-        summary: `Collapsed desktop layout did not release enough width to the center workspace; centerWidthDelta=${centerWidthDelta}.`,
-        centerWidthDelta,
-        centerBox: boxes.center
-      });
-    }
-    if (!restoredWidth) {
-      failures.push({
-        failureType: "overflow",
-        selector: ".center-workspace",
-        viewport,
-        summary: `Restored desktop layout did not return center width near the expanded baseline; centerWidthDelta=${centerWidthDelta}.`,
-        centerWidthDelta,
-        centerBox: boxes.center
-      });
-    }
-    if (!drawerReachable) {
-      failures.push({
-        failureType: "covered-hit-target",
-        selector: "#resource-explorer",
-        viewport,
-        summary: "Mobile resource drawer opened but its quick actions/resource rows were not reachable.",
-        blockedDrawerTargets
-      });
-    }
-    if (!defaultCollapsedMobile) {
-      failures.push({
-        failureType: "blocked/skip",
-        selector: "[data-app-shell]",
-        viewport,
-        summary: "Mobile default workbench did not start with the resource explorer collapsed.",
-        explorerCollapsed
+        summary: "Removed resource explorer selectors are still present in the default workbench DOM.",
+        removedSelectorStates
       });
     }
     if (!rootScrollLocked) {
@@ -6834,13 +6267,8 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
       overflowOk &&
       Object.values(noHorizontalOverflow).every(Boolean) &&
       rightWidthTarget &&
-      keyTargetsRequirement &&
-      collapsedStateMatches &&
-      explorerStateMatches &&
-      collapsedWidthGain &&
-      restoredWidth &&
-      drawerReachable &&
-      defaultCollapsedMobile &&
+      keyTargetsReachable &&
+      removedSelectorsAbsent &&
       sidePanelOverflowUsable;
     const passWithWiring =
       pass &&
@@ -6853,16 +6281,13 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
       mode,
       viewport,
       pass: passWithWiring,
-      explorerCollapsed,
-      explorerVisible,
-      toggle,
+      removedSelectorStates,
+      removedSelectorsAbsent,
       rootScrollLocked,
       rootAfterScrollAttempt,
       boxes,
       centerWidthDelta,
       rightWidthDelta,
-      collapsedWidthGain,
-      restoredWidth,
       rightPanelStacked,
       overlapChecks,
       noHorizontalOverflow,
@@ -6871,12 +6296,8 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
       rightWidthTarget,
       noIncoherentOverlap,
       keyTargetsReachable,
-      keyTargetsRequirement,
       blockedKeyTargets,
-      resizeHandle,
       rightResizeHandle,
-      drawerReachable,
-      blockedDrawerTargets,
       sidePanelScroll,
       sidePanelOverflowUsable,
       hardwareTabsCenterHit,
@@ -6894,7 +6315,6 @@ async function inspectLayoutState(page, { mode, viewport, compareTo }) {
       wiringReadableTwoColumn: wiringLongTableOk && wiringNoHorizontalScroll && wiringTextContained && wiringTextNonOverlapping,
       semanticOverlapChecks,
       overflowChecks,
-      defaultCollapsedMobile,
       issue287HardwareTabsReady,
       issue288SingleTableReady: false,
       skip,
@@ -7157,7 +6577,7 @@ function firstFailure(check) {
 
 function allViewportCoverage(viewportResults, fieldName) {
   return Object.values(viewportResults).every((result) =>
-    Boolean(result.expanded?.[fieldName] ?? result.collapsed?.[fieldName] ?? result.gate?.currentRoute?.[fieldName])
+    Boolean(result.default?.[fieldName] ?? result.gate?.currentRoute?.[fieldName])
   );
 }
 
@@ -7174,12 +6594,11 @@ function summarizeCoverageGap(viewportResults, issueKey) {
       Object.entries(viewportResults).map(([id, result]) => [
         id,
         {
-          viewport: result.expanded?.viewport ?? result.collapsed?.viewport ?? result.gate?.currentRoute?.viewport ?? null,
-          covered: Boolean(result.expanded?.[fieldName] ?? result.collapsed?.[fieldName] ?? result.gate?.currentRoute?.[fieldName]),
+          viewport: result.default?.viewport ?? result.gate?.currentRoute?.viewport ?? null,
+          covered: Boolean(result.default?.[fieldName] ?? result.gate?.currentRoute?.[fieldName]),
           currentVisibleContainersChecked: true,
           skip: [
-            ...(result.expanded?.skip ?? []),
-            ...(result.collapsed?.skip ?? []),
+            ...(result.default?.skip ?? []),
             ...(result.gate?.currentRoute?.skip ?? [])
           ].filter((item) => issueKey === "issue288"
             ? item.summary?.includes("#288")
@@ -7300,7 +6719,7 @@ async function inspectHelpMarkdownRoute(page) {
       codeCount,
       hasRawMarkdownHeading: Boolean(helpContent?.textContent?.includes("# 云工作台内部使用说明")),
       termsPresent:
-        ["左侧资源与功能导航", "Agent 对话与工作清单", "same-origin", "/v1", ":16666"].every((term) => text.includes(term)) &&
+        ["活动栏与默认工作区", "Agent 对话与工作清单", "same-origin", "/v1", ":16666"].every((term) => text.includes(term)) &&
         codeCount >= 8,
       helpPanelScrolls: Boolean(helpScroll && helpScroll.scrollHeight > helpScroll.clientHeight && helpScroll.after > helpScroll.before),
       rootStillLocked,
diff --git a/web/hwlab-cloud-web/app.mjs b/web/hwlab-cloud-web/app.mjs
index 0975a769..442d28e2 100644
--- a/web/hwlab-cloud-web/app.mjs
+++ b/web/hwlab-cloud-web/app.mjs
@@ -79,9 +79,6 @@ const CODEX_STDIO_BLOCKER_MARKERS = Object.freeze([
 ]);
 const UNTRUSTED_CODE_AGENT_PROVIDER_PATTERN = /\b(?:echo|mock|fixture|stub|sample)\b/iu;
 const LAYOUT_STORAGE_KEY = "hwlab.workbench.layout.v1";
-const EXPLORER_DEFAULT_WIDTH = 292;
-const EXPLORER_MIN_WIDTH = 220;
-const EXPLORER_MAX_WIDTH = 420;
 const RIGHT_SIDEBAR_DEFAULT_WIDTH = 620;
 const RIGHT_SIDEBAR_MIN_WIDTH = 560;
 const RIGHT_SIDEBAR_MAX_WIDTH = 760;
@@ -91,14 +88,7 @@ let rpcSequence = 0;
 
 const el = {
   shell: query("[data-app-shell]"),
-  explorerToggle: byId("explorer-toggle"),
-  explorerResize: byId("explorer-resize"),
   rightSidebarResize: byId("right-sidebar-resize"),
-  explorerStatus: byId("explorer-status"),
-  treeCount: byId("tree-count"),
-  resourceTree: byId("resource-tree"),
-  capabilityCount: byId("capability-count"),
-  explorerCapabilities: byId("explorer-capabilities"),
   routePath: byId("route-path"),
   liveStatus: byId("live-status"),
   liveDetail: byId("live-detail"),
@@ -159,18 +149,13 @@ const state = {
     pending: false
   },
   layout: {
-    explorerWidth: EXPLORER_DEFAULT_WIDTH,
     rightSidebarWidth: RIGHT_SIDEBAR_DEFAULT_WIDTH,
-    drag: null,
     rightDrag: null
   }
 };
 
 initRoutes();
 initLayoutSizing();
-initExplorerToggle();
-syncMobileExplorer();
-initExplorerResize();
 initRightSidebarResize();
 initSideTabs();
 initHardwareTabs();
@@ -219,9 +204,7 @@ function initRoutes() {
 
 function initLayoutSizing() {
   const persisted = readPersistedLayout();
-  const explorerWidth = clampExplorerWidth(persisted?.explorerWidth ?? EXPLORER_DEFAULT_WIDTH);
   const rightSidebarWidth = clampRightSidebarWidth(persisted?.rightSidebarWidth ?? RIGHT_SIDEBAR_DEFAULT_WIDTH);
-  setExplorerWidth(explorerWidth, { persist: false });
   setRightSidebarWidth(rightSidebarWidth, { persist: false });
 }
 
@@ -232,7 +215,6 @@ function readPersistedLayout() {
     const payload = JSON.parse(raw);
     if (payload?.version !== 1) return null;
     return {
-      explorerWidth: Number(payload.explorerWidth),
       rightSidebarWidth: Number(payload.rightSidebarWidth)
     };
   } catch {
@@ -246,7 +228,6 @@ function persistLayout() {
       LAYOUT_STORAGE_KEY,
       JSON.stringify({
         version: 1,
-        explorerWidth: state.layout.explorerWidth,
         rightSidebarWidth: state.layout.rightSidebarWidth
       })
     );
@@ -255,16 +236,6 @@ function persistLayout() {
   }
 }
 
-function setExplorerWidth(width, options = {}) {
-  const clamped = clampExplorerWidth(width);
-  state.layout.explorerWidth = clamped;
-  el.shell.style.setProperty("--explorer-width", `${clamped}px`);
-  syncExplorerResizeA11y();
-  syncRightSidebarResizeA11y();
-  if (options.persist !== false) persistLayout();
-  return clamped;
-}
-
 function setRightSidebarWidth(width, options = {}) {
   const clamped = clampRightSidebarWidth(width);
   state.layout.rightSidebarWidth = clamped;
@@ -274,13 +245,6 @@ function setRightSidebarWidth(width, options = {}) {
   return clamped;
 }
 
-function clampExplorerWidth(value) {
-  const numeric = Number(value);
-  const width = Number.isFinite(numeric) ? numeric : EXPLORER_DEFAULT_WIDTH;
-  const bounds = explorerResizeBounds();
-  return Math.min(Math.max(Math.round(width), bounds.min), bounds.max);
-}
-
 function clampRightSidebarWidth(value) {
   const numeric = Number(value);
   const width = Number.isFinite(numeric) ? numeric : RIGHT_SIDEBAR_DEFAULT_WIDTH;
@@ -288,24 +252,6 @@ function clampRightSidebarWidth(value) {
   return Math.min(Math.max(Math.round(width), bounds.min), bounds.max);
 }
 
-function explorerResizeBounds() {
-  const styles = getComputedStyle(el.shell);
-  const cssMin = readCssPixel(styles.getPropertyValue("--explorer-min-width"), EXPLORER_MIN_WIDTH);
-  const cssMax = readCssPixel(styles.getPropertyValue("--explorer-max-width"), EXPLORER_MAX_WIDTH);
-  if (window.matchMedia("(max-width: 860px)").matches) {
-    return { min: EXPLORER_MIN_WIDTH, max: EXPLORER_MAX_WIDTH };
-  }
-  if (window.matchMedia("(max-width: 1240px)").matches) {
-    const railWidth = readCssPixel(styles.getPropertyValue("--rail-width"), 86);
-    const dynamicMax = window.innerWidth - railWidth - 420 - 4;
-    return boundedResizeRange(cssMin, cssMax, dynamicMax);
-  }
-  const railWidth = readCssPixel(styles.getPropertyValue("--rail-width"), 92);
-  const rightWidth = Math.min(Math.max(window.innerWidth * 0.45, 560), 740);
-  const dynamicMax = window.innerWidth - railWidth - 360 - rightWidth - 4;
-  return boundedResizeRange(cssMin, cssMax, dynamicMax);
-}
-
 function boundedResizeRange(min, max, dynamicMax) {
   const safeMin = Math.max(0, Math.round(min));
   const safeMax = Math.max(safeMin, Math.round(Math.min(max, Number.isFinite(dynamicMax) ? dynamicMax : max)));
@@ -320,9 +266,7 @@ function rightSidebarResizeBounds() {
     return { min: 0, max: Math.max(0, window.innerWidth) };
   }
   const railWidth = readCssPixel(styles.getPropertyValue("--rail-width"), 92);
-  const explorerWidth = el.shell.classList.contains("explorer-collapsed") ? 0 : state.layout.explorerWidth;
-  const centerMinWidth = el.shell.classList.contains("explorer-collapsed") ? 420 : 360;
-  const dynamicMax = window.innerWidth - railWidth - explorerWidth - centerMinWidth - 4;
+  const dynamicMax = window.innerWidth - railWidth - 420 - 4;
   return boundedResizeRange(cssMin, cssMax, dynamicMax);
 }
 
@@ -331,14 +275,6 @@ function readCssPixel(value, fallback) {
   return Number.isFinite(parsed) ? parsed : fallback;
 }
 
-function syncExplorerResizeA11y() {
-  const bounds = explorerResizeBounds();
-  el.explorerResize.setAttribute("aria-valuemin", String(bounds.min));
-  el.explorerResize.setAttribute("aria-valuemax", String(bounds.max));
-  el.explorerResize.setAttribute("aria-valuenow", String(state.layout.explorerWidth));
-  el.explorerResize.setAttribute("aria-valuetext", `左侧资源树宽度 ${state.layout.explorerWidth} 像素`);
-}
-
 function syncRightSidebarResizeA11y() {
   const bounds = rightSidebarResizeBounds();
   const disabled = !canResizeRightSidebar();
@@ -374,57 +310,6 @@ function showView(route) {
   }
 }
 
-function initExplorerToggle() {
-  el.explorerToggle.addEventListener("click", () => {
-    const collapsed = !el.shell.classList.contains("explorer-collapsed");
-    setExplorerCollapsed(collapsed);
-  });
-}
-
-function initExplorerResize() {
-  window.addEventListener("resize", () => {
-    if (canResizeExplorer()) setExplorerWidth(state.layout.explorerWidth, { persist: false });
-    syncExplorerResizeA11y();
-  });
-  el.explorerResize.addEventListener("pointerdown", (event) => {
-    if (!canResizeExplorer()) return;
-    event.preventDefault();
-    el.explorerResize.setPointerCapture?.(event.pointerId);
-    state.layout.drag = {
-      pointerId: event.pointerId,
-      startX: event.clientX,
-      startWidth: state.layout.explorerWidth
-    };
-    el.shell.classList.add("is-resizing");
-  });
-  el.explorerResize.addEventListener("pointermove", (event) => {
-    const drag = state.layout.drag;
-    if (!drag || drag.pointerId !== event.pointerId) return;
-    setExplorerWidth(drag.startWidth + event.clientX - drag.startX, { persist: false });
-  });
-  el.explorerResize.addEventListener("pointerup", finishExplorerResize);
-  el.explorerResize.addEventListener("pointercancel", finishExplorerResize);
-  el.explorerResize.addEventListener("keydown", (event) => {
-    if (!canResizeExplorer()) return;
-    const keySteps = {
-      ArrowLeft: -16,
-      ArrowRight: 16,
-      PageDown: -48,
-      PageUp: 48
-    };
-    if (Object.hasOwn(keySteps, event.key)) {
-      event.preventDefault();
-      setExplorerWidth(state.layout.explorerWidth + keySteps[event.key]);
-    } else if (event.key === "Home") {
-      event.preventDefault();
-      setExplorerWidth(explorerResizeBounds().min);
-    } else if (event.key === "End") {
-      event.preventDefault();
-      setExplorerWidth(explorerResizeBounds().max);
-    }
-  });
-}
-
 function initRightSidebarResize() {
   window.addEventListener("resize", () => {
     if (canResizeRightSidebar()) setRightSidebarWidth(state.layout.rightSidebarWidth, { persist: false });
@@ -469,14 +354,6 @@ function initRightSidebarResize() {
   });
 }
 
-function finishExplorerResize(event) {
-  const drag = state.layout.drag;
-  if (!drag || drag.pointerId !== event.pointerId) return;
-  state.layout.drag = null;
-  el.shell.classList.remove("is-resizing");
-  persistLayout();
-}
-
 function finishRightSidebarResize(event) {
   const drag = state.layout.rightDrag;
   if (!drag || drag.pointerId !== event.pointerId) return;
@@ -485,45 +362,10 @@ function finishRightSidebarResize(event) {
   persistLayout();
 }
 
-function canResizeExplorer() {
-  return !window.matchMedia("(max-width: 860px)").matches && !el.shell.classList.contains("explorer-collapsed");
-}
-
 function canResizeRightSidebar() {
   return !window.matchMedia("(max-width: 1240px)").matches;
 }
 
-function setExplorerCollapsed(collapsed) {
-  if (!collapsed) {
-    setExplorerWidth(state.layout.explorerWidth, { persist: false });
-  }
-  el.shell.classList.toggle("explorer-collapsed", collapsed);
-  el.explorerToggle.setAttribute("aria-pressed", collapsed ? "true" : "false");
-  el.explorerToggle.setAttribute("aria-expanded", collapsed ? "false" : "true");
-  el.explorerToggle.setAttribute("aria-label", collapsed ? "展开左侧资源树" : "收起左侧资源树");
-  el.explorerToggle.title = collapsed ? "展开左侧资源树，恢复导航和硬件资源" : "收起左侧资源树，给工作区更多宽度";
-  el.explorerToggle.textContent = collapsed ? "展开资源树" : "收起资源树";
-  const resizeDisabled = collapsed || window.matchMedia("(max-width: 860px)").matches;
-  el.explorerResize.tabIndex = resizeDisabled ? -1 : 0;
-  el.explorerResize.setAttribute("aria-disabled", resizeDisabled ? "true" : "false");
-  el.explorerResize.setAttribute("aria-hidden", resizeDisabled ? "true" : "false");
-  setRightSidebarWidth(state.layout.rightSidebarWidth, { persist: false });
-}
-
-function syncMobileExplorer() {
-  const media = window.matchMedia("(max-width: 860px)");
-  const apply = () => {
-    if (media.matches) {
-      setExplorerCollapsed(true);
-    } else {
-      setExplorerCollapsed(false);
-      setExplorerWidth(state.layout.explorerWidth, { persist: false });
-    }
-  };
-  apply();
-  media.addEventListener("change", apply);
-}
-
 async function loadHelpSurface() {
   el.helpStatus.textContent = "加载中";
   el.helpStatus.className = "state-tag tone-dry-run";
@@ -558,22 +400,14 @@ function initSideTabs() {
   for (const jump of document.querySelectorAll("[data-side-tab-jump]")) {
     jump.addEventListener("click", () => {
       selectSideTab(jump.dataset.sideTabJump);
-      collapseExplorerAfterMobileAction();
     });
   }
 }
 
 function initQuickActions() {
-  for (const button of document.querySelectorAll("[data-focus-command]")) {
-    button.addEventListener("click", () => {
-      el.commandInput.focus();
-      collapseExplorerAfterMobileAction();
-    });
-  }
   for (const button of document.querySelectorAll("[data-agent-quick-prompt]")) {
     button.addEventListener("click", () => {
       fillAgentQuickPrompt(button);
-      collapseExplorerAfterMobileAction();
     });
   }
 }
@@ -586,12 +420,6 @@ function fillAgentQuickPrompt(button) {
   el.commandInput.setSelectionRange(prompt.length, prompt.length);
 }
 
-function collapseExplorerAfterMobileAction() {
-  if (window.matchMedia("(max-width: 860px)").matches) {
-    setExplorerCollapsed(true);
-  }
-}
-
 function selectSideTab(tabId) {
   for (const tab of document.querySelectorAll("[data-side-tab]")) {
     const active = tab.dataset.sideTab === tabId;
@@ -788,12 +616,8 @@ function initGateControls() {
 }
 
 function renderStaticWorkbench() {
-  el.explorerStatus.textContent = "只读工作区";
-  el.explorerStatus.className = "status-dot tone-source";
   el.routePath.textContent = "当前浏览器会话只保存任务草稿，硬件动作需通过受控后端流程。";
 
-  renderResourceTree();
-  renderCapabilityList();
   renderConversation();
   renderTaskList();
   renderHardwareStatus(null);
@@ -1125,86 +949,6 @@ function workbenchApiSurfaceStatus(live, coreProbes = [live.healthLive, live.res
   };
 }
 
-function renderResourceTree() {
-  const items = [
-    {
-      label: gateSummary.topology.projectId,
-      meta: "当前项目",
-      tone: "source",
-      children: [
-        ...gateSummary.topology.gateways.map((gateway) => ({
-          label: gateway.gatewaySessionId,
-          meta: `${gateway.serviceId} / ${statusLabel(gateway.status)}`,
-          tone: gateway.status
-        })),
-        ...gateSummary.topology.boxResources.map((resource) => ({
-          label: resource.resourceId,
-          meta: `${resourceTypeLabel(resource.resourceType)} / ${statusLabel(resource.state)}`,
-          tone: resource.state
-        })),
-        {
-          label: gateSummary.topology.patchPanel.patchPanelStatusId,
-          meta: `${gateSummary.topology.patchPanel.serviceId} / ${statusLabel(gateSummary.topology.patchPanel.state)}`,
-          tone: gateSummary.topology.patchPanel.state
-        }
-      ]
-    },
-    {
-      label: gateSummary.agent.agentSessionId,
-      meta: `${gateSummary.agent.agentServiceId} / Agent 会话`,
-      tone: gateSummary.agent.agentStatus,
-      children: [
-        {
-          label: gateSummary.agent.workerSessionId,
-          meta: `${gateSummary.agent.workerServiceId} / ${statusLabel(gateSummary.agent.workerStatus)}`,
-          tone: gateSummary.agent.workerStatus
-        }
-      ]
-    }
-  ];
-
-  el.treeCount.textContent = String(items.reduce((count, item) => count + 1 + (item.children?.length ?? 0), 0));
-  replaceChildren(el.resourceTree, ...items.map(treeGroup));
-}
-
-function treeGroup(item) {
-  const details = document.createElement("details");
-  details.open = true;
-  const summary = document.createElement("summary");
-  summary.append(statusLight(item.tone), textSpan(item.label, "tree-label"), textSpan(item.meta, "tree-meta"));
-  details.append(summary);
-  for (const child of item.children ?? []) {
-    const row = document.createElement("button");
-    row.type = "button";
-    row.className = "tree-row";
-    row.append(statusLight(child.tone), textSpan(child.label, "tree-label"), textSpan(child.meta, "tree-meta"));
-    details.append(row);
-  }
-  return details;
-}
-
-function renderCapabilityList() {
-  const capabilities = [
-    {
-      title: "任务草稿",
-      detail: "在底部输入区记录要交给 Agent 的任务，不会直接发送硬件请求。",
-      tone: "source"
-    },
-    {
-      title: "资源查看",
-      detail: "查看 Gateway-SIMU、BOX-SIMU 与 hwlab-patch-panel 的只读资源状态。",
-      tone: "source"
-    },
-    {
-      title: "接线核对",
-      detail: "在右侧两列接线表核对互连设备、DO/DI 对应关系与证据记录。",
-      tone: "source"
-    }
-  ];
-  el.capabilityCount.textContent = String(capabilities.length);
-  replaceChildren(el.explorerCapabilities, ...capabilities.map(infoCard));
-}
-
 function renderConversation() {
   const introMessages = [
     {
@@ -2785,12 +2529,6 @@ function infoCard(item) {
   return article;
 }
 
-function statusLight(tone) {
-  const span = document.createElement("span");
-  span.className = `tree-light tone-bg-${toneClass(tone)}`;
-  return span;
-}
-
 function badge(text, tone = text) {
   const span = document.createElement("span");
   span.className = `badge tone-${toneClass(tone)}`;
@@ -3252,15 +2990,6 @@ function roleLabel(role) {
   );
 }
 
-function resourceTypeLabel(type) {
-  return (
-    {
-      board: "板卡",
-      relay: "继电器"
-    }[String(type ?? "").toLowerCase()] ?? statusLabel(type)
-  );
-}
-
 function recordKindLabel(kind) {
   return (
     {
diff --git a/web/hwlab-cloud-web/help.md b/web/hwlab-cloud-web/help.md
index c0d8d8b8..2614256a 100644
--- a/web/hwlab-cloud-web/help.md
+++ b/web/hwlab-cloud-web/help.md
@@ -2,12 +2,12 @@
 
 本页面说明当前 Cloud Workbench 的前端区域与状态含义。默认 `/` 仍进入工作台；本说明只通过工作台内部的 `#help` 入口打开，不作为默认页。
 
-## 左侧资源与功能导航
+## 活动栏与默认工作区
 
-- 活动栏使用完整中文标签：`工作台` 回到默认工作台，`内部复核` 打开只读复核表，`使用说明` 打开本说明，`资源树` 展开或收起资源树。
+- 活动栏使用完整中文标签：`工作台` 回到默认工作台，`内部复核` 打开只读复核表，`使用说明` 打开本说明。
 - 左侧不再放独立的可信记录跳转；可信记录保留在右侧子面板。
-- 资源树只展示当前项目、Gateway-SIMU、BOX-SIMU、`hwlab-patch-panel`、Agent manager / worker 等用户可理解资源，不把 M0-M5 Gate 状态放在默认首屏。
-- 常用能力区提供任务草稿、资源查看与接线核对入口。`LOCAL` 只表示浏览器本地草稿，不等同于 DEV-LIVE。
+- 默认首屏不再放资源树、能力卡片或左侧抽屉，空间直接分配给 Code Agent 对话、执行证据、硬件状态、接线和控制。
+- `LOCAL` 只表示浏览器本地草稿，不等同于 DEV-LIVE。
 
 ## 中间 Agent 对话与工作清单
 
diff --git a/web/hwlab-cloud-web/index.html b/web/hwlab-cloud-web/index.html
index 883f88da..344d1e22 100644
--- a/web/hwlab-cloud-web/index.html
+++ b/web/hwlab-cloud-web/index.html
@@ -14,49 +14,6 @@
         <button class="rail-button" type="button" data-route="gate" title="内部复核" aria-label="内部复核">内部复核</button>
         <button class="rail-button" type="button" data-route="help" title="使用说明" aria-label="使用说明">使用说明</button>
         <span class="rail-spacer" aria-hidden="true"></span>
-        <button class="rail-button" id="explorer-toggle" type="button" title="收起左侧资源树，给工作区更多宽度" aria-label="收起左侧资源树" aria-controls="resource-explorer" aria-expanded="true" aria-pressed="false">收起资源树</button>
-      </aside>
-
-      <aside class="explorer" id="resource-explorer" aria-label="资源浏览与硬件资源树">
-        <header class="explorer-head">
-          <div>
-            <p class="eyebrow">HWLAB Cloud</p>
-            <h1>云工作台</h1>
-          </div>
-          <span class="status-dot tone-source" id="explorer-status">只读工作区</span>
-        </header>
-        <section class="quick-actions" aria-label="常用工作入口">
-          <button type="button" data-focus-command>编写任务</button>
-          <button type="button" data-side-tab-jump="wiring">查看接线</button>
-          <button type="button" data-side-tab-jump="control">查看状态</button>
-        </section>
-        <section class="tree-panel">
-          <div class="panel-title-row">
-            <h2>硬件资源</h2>
-            <span id="tree-count">0</span>
-          </div>
-          <nav id="resource-tree" class="resource-tree" aria-label="HWLAB 硬件资源"></nav>
-        </section>
-        <section class="tree-panel blockers-panel">
-          <div class="panel-title-row">
-            <h2>常用能力</h2>
-            <span id="capability-count">0</span>
-          </div>
-          <div id="explorer-capabilities" class="compact-list"></div>
-        </section>
-        <div
-          class="resize-handle explorer-resize"
-          id="explorer-resize"
-          role="separator"
-          tabindex="0"
-          aria-label="拖拽调整左侧资源树宽度"
-          aria-controls="resource-explorer"
-          aria-orientation="vertical"
-          aria-valuemin="220"
-          aria-valuemax="420"
-          aria-valuenow="292"
-          title="拖拽调整左侧资源树宽度；用左右方向键微调，Home/End 到最小或最大。"
-        ></div>
       </aside>
 
       <section class="center-workspace">
diff --git a/web/hwlab-cloud-web/scripts/check.mjs b/web/hwlab-cloud-web/scripts/check.mjs
index 25c96e8f..cf525dd8 100644
--- a/web/hwlab-cloud-web/scripts/check.mjs
+++ b/web/hwlab-cloud-web/scripts/check.mjs
@@ -245,17 +245,9 @@ assert.equal(
   "#288 single-table gate is future coverage; current /gate route remains covered by layout smoke"
 );
 for (const layoutCheckId of [
-  "layout-desktop-expanded",
-  "layout-desktop-collapsed",
-  "layout-desktop-restored",
-  "layout-narrow-desktop-expanded",
-  "layout-narrow-desktop-collapsed",
-  "layout-narrow-desktop-restored",
-  "layout-mobile-collapsed",
-  "layout-mobile-drawer",
-  "layout-explorer-resize-desktop",
-  "layout-explorer-resize-narrow-desktop",
-  "layout-explorer-resize-mobile",
+  "layout-desktop-default",
+  "layout-narrow-desktop-default",
+  "layout-mobile-default",
   "layout-right-sidebar-resize-desktop",
   "layout-right-sidebar-resize-narrow-desktop",
   "layout-right-sidebar-resize-mobile",
@@ -387,10 +379,6 @@ assert.match(html, /href="\/styles\.css"/);
 assert.match(html, /src="\/app\.mjs"/);
 for (const workbenchElement of [
   "activity-rail",
-  "explorer",
-  "explorer-resize",
-  "resource-explorer",
-  "resource-tree",
   "conversation-list",
   "agent-chat-status",
   "code-agent-summary",
@@ -410,29 +398,41 @@ for (const workbenchElement of [
 ]) {
   assert.match(html, new RegExp(workbenchElement));
 }
-assert.match(html, /id="explorer-toggle"/);
-assert.match(html, /aria-controls="resource-explorer"/);
-assert.match(html, /aria-expanded="true"/);
-assert.match(html, /aria-pressed="false"/);
-assert.match(html, /aria-label="收起左侧资源树"/);
-assert.match(html, />收起资源树<\/button>/);
-assert.match(html, /id="explorer-resize"/);
-assert.match(html, /role="separator"/);
-assert.match(html, /aria-label="拖拽调整左侧资源树宽度"/);
-assert.match(html, /aria-valuemin="220"/);
-assert.match(html, /aria-valuemax="420"/);
-assert.match(html, /aria-valuenow="292"/);
+for (const removedSelectorTerm of [
+  "id=\"resource-explorer\"",
+  "id=\"explorer-toggle\"",
+  "id=\"explorer-resize\"",
+  "id=\"resource-tree\"",
+  "explorer-capabilities",
+  "capability-count",
+  "tree-count",
+  "quick-actions",
+  "data-focus-command"
+]) {
+  assert.doesNotMatch(html, new RegExp(escapeRegExp(removedSelectorTerm)), `removed resource explorer selector returned: ${removedSelectorTerm}`);
+}
+for (const removedUiText of [
+  "资源浏览与硬件资源树",
+  "只读工作区",
+  "常用能力",
+  "收起资源树",
+  "展开资源树",
+  "拖拽调整左侧资源树宽度",
+  "资源查看",
+  "查看接线",
+  "查看状态",
+  "编写任务"
+]) {
+  assert.doesNotMatch(`${html}\n${app}\n${styles}`, new RegExp(escapeRegExp(removedUiText)), `removed resource explorer copy returned: ${removedUiText}`);
+}
 assert.match(html, /id="hardware-sidebar"/);
 assert.match(html, /id="right-sidebar-resize"/);
 assert.match(html, /aria-label="拖拽调整右侧硬件状态栏宽度"/);
 assert.match(html, /aria-valuemin="560"/);
 assert.match(html, /aria-valuemax="760"/);
 assert.match(html, /aria-valuenow="620"/);
-assert.match(app, /setAttribute\("aria-label", collapsed \? "展开左侧资源树" : "收起左侧资源树"\)/);
-assert.match(app, /textContent = collapsed \? "展开资源树" : "收起资源树"/);
+assert.doesNotMatch(app, /setExplorerCollapsed|initExplorerResize|clampExplorerWidth|syncMobileExplorer|collapseExplorerAfterMobileAction/);
 assert.match(app, /LAYOUT_STORAGE_KEY\s*=\s*"hwlab\.workbench\.layout\.v1"/);
-assert.match(app, /function initExplorerResize/);
-assert.match(app, /function clampExplorerWidth/);
 assert.match(app, /function initRightSidebarResize/);
 assert.match(app, /function clampRightSidebarWidth/);
 assert.match(app, /function rightSidebarResizeBounds/);
@@ -443,20 +443,14 @@ assert.match(app, /ArrowLeft/);
 assert.match(app, /ArrowRight/);
 assert.match(app, /event\.key === "Home"/);
 assert.match(app, /event\.key === "End"/);
-assert.match(styles, /--explorer-width:\s*292px/);
-assert.match(styles, /--explorer-min-width:\s*220px/);
-assert.match(styles, /--explorer-max-width:\s*420px/);
+assert.doesNotMatch(styles, /--explorer-width|--explorer-min-width|--explorer-max-width|\.explorer|\.explorer-resize|\.quick-actions|\.resource-tree|\.tree-panel|\.tree-row|\.tree-label/);
 assert.match(styles, /--right-sidebar-width:\s*620px/);
 assert.match(styles, /--right-sidebar-min-width:\s*560px/);
 assert.match(styles, /--right-sidebar-max-width:\s*760px/);
 assert.match(styles, /--right-width:\s*clamp\(var\(--right-sidebar-min-width\),\s*var\(--right-sidebar-width\),\s*var\(--right-sidebar-max-width\)\)/);
 assert.match(styles, /--right-width-expanded:\s*clamp\(var\(--right-sidebar-min-width\),\s*var\(--right-sidebar-width\),\s*var\(--right-sidebar-max-width\)\)/);
-assert.match(styles, /\.explorer-resize\s*{[^}]*cursor:\s*col-resize;/s);
 assert.match(styles, /\.right-sidebar-resize\s*{[^}]*cursor:\s*col-resize;/s);
-assert.match(styles, /\.explorer-collapsed \.explorer-resize\s*{[^}]*display:\s*none;/s);
-assert.match(styles, /@media \(max-width: 860px\)[\s\S]*?\.explorer-resize\s*{[\s\S]*?display:\s*none;/);
 assert.match(styles, /@media \(max-width: 1240px\)[\s\S]*?\.right-sidebar-resize\s*{[\s\S]*?display:\s*none;/);
-assert.match(styles, /\.explorer-collapsed\s*\{[^}]*--explorer-width:\s*0px;[^}]*grid-template-columns:\s*var\(--rail-width\)\s+0\s+minmax\(420px,\s*1fr\)\s+var\(--right-width\);/s);
 for (const viewId of ["workspace", "gate"]) {
   assert.match(html, new RegExp(`data-view="${viewId}"`));
 }
@@ -481,7 +475,7 @@ assert.match(styles, /body\s*>\s*\[data-app-shell\]\s*{[^}]*height:\s*100%;[^}]*
 assert.match(styles, /\.workbench-shell\s*{[^}]*height:\s*100dvh;[^}]*max-height:\s*100dvh;[^}]*overflow:\s*hidden;[^}]*overscroll-behavior:\s*contain;/s);
 assert.match(helpMarkdown, /^# 云工作台内部使用说明/m);
 for (const helpTerm of [
-  "左侧资源与功能导航",
+  "活动栏与默认工作区",
   "Agent 对话与工作清单",
   "完整中文标签",
   "内部复核",
@@ -512,7 +506,7 @@ const defaultFirstViewportText = visibleTextFromHtml(defaultFirstViewportHtml(ht
 for (const backendTerm of ["Gate", "诊断", "验收", "BLOCKED", "SOURCE", "DRY-RUN", "DEV-LIVE", "M0-M5", "M3 基本", "trace/evidence", "执行轨迹", "OPENAI_API_KEY", "Secret", "secretRef", "hwlab-code-agent-provider", "m3-route-required", "waiting-for-dev-live"]) {
   assert.equal(textHasForbiddenTerm(defaultFirstViewportText, backendTerm), false, `default workbench must not expose backend term ${backendTerm}`);
 }
-for (const fullNavLabel of ["工作台", "内部复核", "使用说明", "收起资源树"]) {
+for (const fullNavLabel of ["工作台", "内部复核", "使用说明"]) {
   assert.match(html, new RegExp(`>${escapeRegExp(fullNavLabel)}<`), `missing full nav label ${fullNavLabel}`);
 }
 for (const oneCharNavLabel of [">台<", ">证<", ">诊<", ">帮<"]) {
@@ -625,10 +619,6 @@ assert.doesNotMatch(app, /API 错误 \/ 只读模式/);
 assert.doesNotMatch(app, /可信记录受阻 \/ 只读模式/);
 assert.doesNotMatch(app, /API 降级 \/ 只读模式/);
 assert.doesNotMatch(functionBody(app, "workbenchApiSurfaceStatus"), /runtime_durable_adapter_query_blocked|DB live readiness|Gate|诊断|验收|M0-M5|执行轨迹/u);
-assert.match(html, /quick-actions/);
-assert.match(html, /编写任务/);
-assert.match(html, /查看接线/);
-assert.match(html, /查看状态/);
 assert.match(html, /placeholder="输入要发送给 Code Agent 的消息；不会直接触发硬件变更。"/);
 assert.match(html, />发送<\/button>/);
 assert.doesNotMatch(html, />添加草稿<\/button>/);
@@ -828,15 +818,8 @@ assert.match(styles, /html,\s*\nbody\s*{[^}]*height:\s*100%;[^}]*overflow:\s*hid
 assert.match(styles, /body\s*>\s*\[data-app-shell\]\s*{[^}]*min-height:\s*0;/s);
 assert.match(styles, /\.workbench-shell\s*{[^}]*height:\s*100(?:d)?vh;[^}]*overflow:\s*hidden;/s);
 assert.match(styles, /\.view\s*{[^}]*min-height:\s*0;[^}]*overflow:\s*auto;/s);
-assert.match(styles, /\.(?:resource-tree|compact-list|conversation-list|task-list|hardware-list)[^{]*{[^}]*min-height:\s*0;[^}]*overflow:\s*auto;/s);
-assert.match(app, /function syncMobileExplorer/);
-assert.match(app, /window\.matchMedia\("\(max-width: 860px\)"\)/);
-assert.match(app, /setExplorerCollapsed\(true\)/);
-assert.match(app, /function collapseExplorerAfterMobileAction/);
-assert.match(functionBody(app, "setExplorerCollapsed"), /aria-expanded/);
-assert.match(styles, /\.explorer-collapsed \.explorer\s*{[^}]*pointer-events:\s*none;/s);
+assert.match(styles, /\.(?:compact-list|conversation-list|task-list|hardware-list)[^{]*{[^}]*min-height:\s*0;[^}]*overflow:\s*auto;/s);
 assert.match(styles, /@media \(max-width: 860px\)[\s\S]*?\.activity-rail\s*{[\s\S]*?grid-row:\s*1 \/ 3;/);
-assert.match(styles, /@media \(max-width: 860px\)[\s\S]*?\.explorer\s*{[\s\S]*?grid-row:\s*1 \/ 3;[\s\S]*?z-index:\s*4;/);
 assert.match(styles, /@media \(max-width: 860px\)[\s\S]*?\.center-workspace\s*{[\s\S]*?grid-row:\s*1;/);
 assert.match(styles, /@media \(max-width: 860px\)[\s\S]*?\.right-sidebar\s*{[\s\S]*?grid-row:\s*2;/);
 assert.match(styles, /@media \(max-width: 520px\)[\s\S]*?\.command-bar\s*{[\s\S]*?grid-template-columns:\s*minmax\(0, 1fr\) auto auto;/);
diff --git a/web/hwlab-cloud-web/styles.css b/web/hwlab-cloud-web/styles.css
index d42eb7bd..e7c8f88a 100644
--- a/web/hwlab-cloud-web/styles.css
+++ b/web/hwlab-cloud-web/styles.css
@@ -18,9 +18,6 @@
   --bad: #e76e5e;
   --info: #7ea6c9;
   --rail-width: 92px;
-  --explorer-width: 292px;
-  --explorer-min-width: 220px;
-  --explorer-max-width: 420px;
   --right-sidebar-width: 620px;
   --right-sidebar-min-width: 560px;
   --right-sidebar-max-width: 760px;
@@ -83,7 +80,7 @@ ul {
   max-height: 100dvh;
   min-height: 0;
   display: grid;
-  grid-template-columns: var(--rail-width) var(--explorer-width) minmax(360px, 1fr) var(--right-width-expanded);
+  grid-template-columns: var(--rail-width) minmax(420px, 1fr) var(--right-width-expanded);
   grid-template-rows: 1fr;
   overflow: hidden;
   overscroll-behavior: contain;
@@ -91,7 +88,6 @@ ul {
 }
 
 .activity-rail,
-.explorer,
 .right-sidebar,
 .center-workspace {
   min-width: 0;
@@ -100,7 +96,7 @@ ul {
 
 .activity-rail {
   display: grid;
-  grid-template-rows: repeat(3, minmax(42px, auto)) 1fr minmax(42px, auto);
+  grid-template-rows: repeat(3, minmax(42px, auto)) minmax(0, 1fr);
   gap: 6px;
   padding: 8px;
   background: var(--rail);
@@ -129,10 +125,6 @@ ul {
   word-break: keep-all;
 }
 
-#explorer-toggle {
-  min-height: 44px;
-}
-
 .rail-button:hover,
 .rail-button:focus-visible,
 .rail-button.active {
@@ -146,22 +138,6 @@ ul {
   box-shadow: inset 3px 0 0 var(--accent);
 }
 
-.explorer {
-  position: relative;
-  display: grid;
-  grid-template-rows: auto auto minmax(0, 1fr) auto;
-  gap: 8px;
-  padding: 10px 14px 10px 10px;
-  background: rgba(22, 25, 22, 0.98);
-  border-right: 1px solid var(--line);
-  overflow: hidden;
-}
-
-.explorer-collapsed {
-  --explorer-width: 0px;
-  grid-template-columns: var(--rail-width) 0 minmax(420px, 1fr) var(--right-width);
-}
-
 .workbench-shell.is-resizing {
   cursor: col-resize;
   user-select: none;
@@ -181,21 +157,6 @@ ul {
   opacity: 0.56;
 }
 
-.explorer-resize {
-  top: 0;
-  right: 0;
-  width: 12px;
-  height: 100%;
-  cursor: col-resize;
-}
-
-.explorer-resize::before {
-  top: 10px;
-  bottom: 10px;
-  left: 5px;
-  width: 2px;
-}
-
 .right-sidebar-resize {
   top: 0;
   left: 0;
@@ -223,25 +184,6 @@ ul {
   outline-offset: -2px;
 }
 
-.explorer-collapsed .explorer {
-  padding: 0;
-  border-right: 0;
-  overflow: hidden;
-}
-
-.explorer-collapsed .explorer > * {
-  display: none;
-}
-
-.explorer-collapsed .explorer {
-  pointer-events: none;
-}
-
-.explorer-collapsed .explorer-resize {
-  display: none;
-}
-
-.explorer-head,
 .topbar,
 .hardware-status,
 .side-workspace,
@@ -250,15 +192,6 @@ ul {
   border: 1px solid var(--line);
 }
 
-.explorer-head {
-  min-height: 78px;
-  display: flex;
-  justify-content: space-between;
-  gap: 10px;
-  align-items: start;
-  padding: 12px;
-}
-
 .eyebrow {
   color: var(--accent-2);
   font-size: 10px;
@@ -305,42 +238,6 @@ h3 {
   overflow-wrap: anywhere;
 }
 
-.quick-actions {
-  display: grid;
-  grid-template-columns: 1fr;
-  gap: 6px;
-}
-
-.quick-actions button {
-  width: 100%;
-  min-height: 32px;
-  padding: 6px 8px;
-  border: 1px solid var(--line);
-  background: var(--surface-2);
-  color: var(--text);
-  font-weight: 760;
-  text-align: left;
-  cursor: pointer;
-}
-
-.quick-actions button:hover,
-.quick-actions button:focus-visible {
-  border-color: var(--line-strong);
-  background: var(--surface-3);
-  outline: 0;
-}
-
-.tree-panel {
-  min-height: 0;
-  display: grid;
-  grid-template-rows: auto minmax(0, 1fr);
-  gap: 8px;
-  padding: 10px;
-  background: var(--surface);
-  border: 1px solid var(--line);
-  overflow: hidden;
-}
-
 .blockers-panel {
   max-height: 230px;
 }
@@ -362,7 +259,6 @@ h3 {
   color: var(--muted);
 }
 
-.resource-tree,
 .compact-list,
 .conversation-list,
 .task-list,
@@ -371,70 +267,6 @@ h3 {
   overflow: auto;
 }
 
-.resource-tree {
-  display: grid;
-  align-content: start;
-  gap: 6px;
-}
-
-.resource-tree details {
-  border: 1px solid var(--line);
-  background: var(--surface-2);
-}
-
-.resource-tree summary,
-.tree-row {
-  width: 100%;
-  min-height: 31px;
-  display: grid;
-  grid-template-columns: 8px minmax(0, 1fr);
-  gap: 7px;
-  align-items: center;
-  padding: 7px 8px;
-  border: 0;
-  background: transparent;
-  text-align: left;
-}
-
-.resource-tree summary {
-  cursor: pointer;
-}
-
-.tree-row {
-  padding-left: 22px;
-  border-top: 1px solid var(--line);
-  cursor: pointer;
-}
-
-.tree-row:hover {
-  background: rgba(212, 173, 67, 0.06);
-}
-
-.tree-label,
-.tree-meta {
-  display: block;
-  min-width: 0;
-  overflow-wrap: anywhere;
-}
-
-.tree-label {
-  color: var(--text);
-  font-family: var(--mono);
-  font-size: 11px;
-}
-
-.tree-meta {
-  grid-column: 2;
-  color: var(--muted);
-  font-size: 11px;
-}
-
-.tree-light {
-  width: 8px;
-  height: 8px;
-  background: var(--dim);
-}
-
 .center-workspace {
   display: grid;
   grid-template-rows: auto minmax(0, 1fr) auto;
@@ -1741,20 +1573,12 @@ tbody tr:last-child td {
 @media (max-width: 1240px) {
   .workbench-shell {
     --rail-width: 86px;
-    --explorer-width: 260px;
-    --explorer-min-width: 210px;
-    --explorer-max-width: 320px;
-    grid-template-columns: var(--rail-width) var(--explorer-width) minmax(420px, 1fr);
+    grid-template-columns: var(--rail-width) minmax(0, 1fr);
     grid-template-rows: minmax(0, 1fr) clamp(220px, 36dvh, 360px);
   }
 
-  .explorer-collapsed {
-    --explorer-width: 0px;
-    grid-template-columns: var(--rail-width) 0 minmax(0, 1fr);
-  }
-
   .right-sidebar {
-    grid-column: 2 / 4;
+    grid-column: 2;
     grid-row: 2;
     min-height: 0;
     padding-left: 10px;
@@ -1768,11 +1592,8 @@ tbody tr:last-child td {
 }
 
 @media (max-width: 860px) {
-  .workbench-shell,
-  .explorer-collapsed {
+  .workbench-shell {
     --rail-width: 68px;
-    --explorer-min-width: 0px;
-    --explorer-max-width: 0px;
     grid-template-columns: var(--rail-width) minmax(0, 1fr);
     grid-template-rows: minmax(0, 1fr) clamp(214px, 30dvh, 280px);
   }
@@ -1780,7 +1601,7 @@ tbody tr:last-child td {
   .activity-rail {
     grid-column: 1;
     grid-row: 1 / 3;
-    grid-template-rows: repeat(3, minmax(42px, auto)) minmax(12px, 1fr) minmax(42px, auto);
+    grid-template-rows: repeat(3, minmax(42px, auto)) minmax(12px, 1fr);
     overflow: hidden;
   }
 
@@ -1789,20 +1610,6 @@ tbody tr:last-child td {
     line-height: 1.15;
   }
 
-  .explorer {
-    grid-column: 2;
-    grid-row: 1 / 3;
-    z-index: 4;
-    max-height: 100%;
-    padding: 10px;
-    overflow: auto;
-    box-shadow: -1px 0 0 var(--line), 12px 0 24px rgba(0, 0, 0, 0.24);
-  }
-
-  .explorer-resize {
-    display: none;
-  }
-
   .right-sidebar-resize {
     display: none;
   }
@@ -1824,10 +1631,6 @@ tbody tr:last-child td {
     grid-template-rows: auto minmax(0, auto) minmax(0, 1fr);
   }
 
-  .explorer-collapsed .explorer {
-    display: none;
-  }
-
   .topbar {
     min-height: 0;
     gap: 8px;
@@ -1889,8 +1692,7 @@ tbody tr:last-child td {
 
   .hardware-list,
   .m3-control-grid,
-  .m3-control-actions,
-  .quick-actions {
+  .m3-control-actions {
     grid-template-columns: 1fr;
   }
 
@@ -1939,8 +1741,7 @@ tbody tr:last-child td {
 }
 
 @media (max-width: 520px) {
-  .workbench-shell,
-  .explorer-collapsed {
+  .workbench-shell {
     --rail-width: 64px;
     grid-template-columns: var(--rail-width) minmax(0, 1fr);
     grid-template-rows: minmax(0, 1fr) clamp(260px, 34dvh, 320px);